Using Lyra With Epic Online Services

A step-by-step tutorial describing how to use the Lyra sample game for working with Epic Online Services.

The Lyra Starter Game is an example project that is designed for developing and shipping a multiplayer game. It uses its online multiplayer support and integrates with the Epic Online Services (EOS) backend. However, if you downloaded Lyra from the Epic Games Launcher, then it will not work with EOS without some additional setup.

Epic Account and Engine Setup

To use EOS in Lyra, you will need to set up accounts for access to both EOS and the Unreal engine source code:

  1. To test multiplayer, you need at least 2 Epic Accounts. You can create a new account by navigating to the Epic Games Store page, then click Sign In, and Sign Up with a new email address and password.

    For efficiency, you can use a second browser to login with your second account.

  2. To enable full EOS support, you need one Account that has access to the Unreal Engine source code. Check that your primary Epic Account is synced with GitHub as described in Unreal on GitHub.

  3. Once you have source code access, follow Downloading Unreal Engine Source Code to download and install the engine source code. Install the Release branch of the engine. You can use either Visual Studio 2019 or Visual Studio 2022.

    Downloading the source code and running Setup.bat can take some time. We recommend you continue with account creation while waiting for the setup to complete.

  4. You need to enable 2-factor authentication on both accounts to gain access to the EOS developer tools. This can be done from the Account Management page, by navigating to Password & Security, or can be prompted when you perform step 5.

  5. Both Epic Accounts need access to the EOS Developer Portal (Dev Portal). When you navigate to the Dev Portal, a prompt appears to accept licenses and to choose between starting On your own, or As an Organization. Choose As an Organization to create an organization with your primary Account.

  6. While you are logged into your primary Account and Organization using the Dev Portal, you will need to add your secondary Account to the Organization. Click the Organization section on the left in the Developer Portal table of contents, then from the Team tab, click the Invite button. You are then prompted to fill in the email address of your secondary Account.

    The role does not matter for development testing so you can select Community Tools before clicking Invite. You can rename your Organization by clicking Settings. Optionally, you can make an organization for your secondary Account, however, it is not necessary for this tutorial.

  7. Your secondary Account will receive an invite link in the email. You will need to visit this URL while signing in to your secondary Account.

    You can paste the URL into the browser where your secondary Account is already signed in to accept the invite.

After accepting the invite, the secondary Account will not be used for anything other than logging in during testing.

Epic Online Services Product Setup

When you have an Epic Account with Developer access and an Organization, you need to set up a product on the backend to use in your local copy of Lyra. To develop and test Lyra on the PC platform, an additional setup needs to be completed for both EOS and Epic Account Services (EAS).

Epic Account Services provides authentication and social tools designed to integrate with EOS. The use of EAS is not required if you have access to another authentication system provided by a platform or publisher. Lyra uses EAS to handle development login as well as integration with Epic Games Store.

The steps in this section are all performed in the EOS Dev Portal and cover the same information as the EOS setup guide and the Epic Account Services getting started page:

  1. First, you need to set up a Product. You can create a new product by selecting Create Product. You can then select your product to see the options for the various EOS features.

  2. Next, you need to set up a Client and Client policy for your version of Lyra. From the Product Settings, click the Clients tab. This prompts you to read and accept legal agreements After doing so, the Clients page displays prompts for additional licenses. For this tutorial, you need to accept the licenses for Epic Account Services.

  3. Click Add New Client to create a new client named "Lyra Test Client". Then click Add New Client Policy.

  4. In the Client policy name field, enter "Peer to Peer client" as it can be reused for multiple products. For the Client policy type, select Peer2Peer as it provides everything needed by Lyra. Click Save & Exit twice to save your new policy and client.

  5. To allow the use of EOS for development testing, you need to set up an Application to connect your product with EAS. To use your game with EOS, you need to set up an EOS Application on the service. This links your game with Epic Account Services. To do this, select Epic Account Services, This prompts you to read and accept legal agreements. After doing so, click the Permissions (1) field of your Lyra Test Product. Or, you can click Create Application (2) and click the Permissions tab in the upper right.

    The Brand Settings need to be set up before the release, however, it is not required for development and testing.


  6. On the Permissions page, enable both Online Presence (1) and Friends (2) as Lyra needs them to enable social features. Click Save Changes (3).

  7. Select Linked Clients (1), then click the drop-down arrow next to Select Clients and choose the Lyra Test Client (2) to link it to this application, then click Save Changes(3).

    You can navigate to the Product Settings page and from the General tab, scroll down to view all the information you will require later.

  8. The final step for EOS setup is to install the Developer Authentication Tool. This makes multiplayer testing easier because you can log in to each account once instead of having to do a 2-factor authentication check every single time you launch the game.

There is a copy of the authentication tool inside the Engine/Source/ThirdParty/EOSSDK/Tools folder of your UE5 source installation directory, or it can be found inside the EOS SDK download.

Installing and Configuring Lyra

You now have a fully downloaded version of the engine and a completely set up EOS product. The steps below walk you through the process of installing, configuring, and building Lyra so it can be used with EOS. These steps are similar to those in the Lyra documentation.

  1. Open the Epic Games Launcher (log in with your primary Account), and select Unreal Engine > Samples. Click Lyra Starter Game and then Create Project.

  2. Do not accept the default settings. Instead, name your project.

    If you are planning on adapting Lyra into another game, you should use that name here.

  3. Select the root folder where you installed your engine source code. click Browse to select that folder, then click Create to download the project. After this, you should have both an Engine subfolder and a subfolder matching the project name (LyraStarterGame by default) you just selected.

  4. You will need to install the UnrealVS extension located in the Engine/Extras/UnrealVS folder. This provides you with easy management of the startup project and command line parameters inside of Visual Studio.

  5. Navigate to the root of your engine source code, then install and run GenerateProjectFiles.bat to create a new solution file called UE5.sln. Double-click that file to load Visual Studio. After a loading time, your version of the LyraStarterGame is listed in the Solution Explorer under the Games category (including LyraGameEOS).

  6. Right-click LyraStarterGame, select Set As Startup Project then build it.

    This will compile Lyra and all the engine features required and may take a while. If you have any compile errors, you need to resolve them before continuing.

  7. Once Lyra has been built from source, you can run it from the Debug menu and explore the project sample.

  8. You need an additional set-up so the project is configured for EOS. Lyra comes with EOS-specific config files that are enabled using the CustomConfig feature of the Common User Plugin.

You will need to modify the DefaultEngine.ini located in the Config/Custom/EOS folder inside your project. Open the file and search for the following line:

You can remove the starting semi-colon to uncomment the line.

;For OSSV1, fill in the following line with actual details and then uncomment


  1. You need to modify the Artifacts line for the EOS product you made earlier. The information you require is visible on the Product Settings page of the EOS dashboard. The process for doing this is described in the EOS OSS Plugin documentation, however, below are the important fields:

    • Artifact Name is used to label this unique combination of settings and should match the value of the DefaultArtifactName=OSSv1EOS line.

    • Navigate to the Developer Portal. Copy the Product ID, Client ID, and Client Secret from the same text fields in the Product and Clients sections.

    Click Copy to copy those values to your clipboard, then Paste them into your text editor.

    • The Sandbox ID describes how to find data for features like achievements, you can use the ID for the default Live sandbox. Deployment ID can be set to the Release ID as the game is still in development. Once you are further into development you may want to create multiple sandboxes and deployments for testing and release.

    • The Encryption Key is used to encrypt client-written files saved in the cloud, but Lyra does not actually use that feature. You can set this value to "0" or any random 64-bit number in quotations.

  2. After modifying the config file, save.

Testing EOS in an Editor Build

You can now begin the steps to test the game in the editor and packaged builds.

  1. Inside Visual Studio, enable the UnrealVS toolbar, and add the following line to the command line section:

    -game -customconfig=EOS  
  2. Debug the project to launch with the new command line, this launches in standalone game mode and uses the EOS config files. When finished, an error message displays "Login Failure Not Implemented".

  3. Click OK and the Lyra main menu will load. This error message means your project is trying to use EOS but is failing to log in because you did not specify enough information on the command line. If you do not see a login failure error message, there may be an error with the config file, therefore you should search the output log for any errors related to EOS.


  1. Now, run the Developer Authentication Tool you unzipped in the Epic Online Services Product Setup step. When you run the EOS_DevAuthTool program, it prompts you for a port to use, enter 6666.

On Windows, you may receive an additional prompt asking for firewall access. You need to allow access.

  1. Next, click Login to open an embedded browser where you can log in with your primary Epic Account. After entering your two-factor code, it prompts you for a Credential name, enter "Player1" or something similar.


  1. Repeat this process for your secondary Account, but give it a different credential name like "Player2". Your two Accounts will stay logged into the EOS backend for that testing session. Eventually, you will need to reboot the dev tool and log in again to refresh the authentication.

  2. Navigate back to Visual Studio and add the following options to your command line in UnrealVS:

    -AUTH_LOGIN=localhost:6666 -AUTH_PASSWORD=Player1 -AUTH_TYPE=developer

However, you need to replace the port and credential name with the one you picked above. For example, the full command line at this point could be:

LyraStarterGame -game -customconfig=EOS -AUTH_LOGIN=localhost:6666 -AUTH_PASSWORD=Player1 -AUTH_TYPE=developer.


  1. Click Debug to launch the game again. This time, it uses the extra info on the command line to log in to EOS. A browser window opens to warn you about an unverified application, this is because of the incomplete Brand Settings. Click accept twice to authorize linking the Application to your Epic Account. This takes you back into the game and displays the main menu with no error message. Press shift+F3 to open the Epic Account overlay that indicates you are fully logged in.

  2. This account is the host for your multiplayer game, so click Play Lyra then Start a Game to load the hosting screen. Ensure Network is set to Online, then select Elimination to start the match.

    You may want to set your graphics quality to Low and enable windowed mode in the settings menu to make sure your computer can handle two copies of the game.

  3. Return to Visual Studio and detach this client from the Debug menu. Prepare your secondary account login by changing the -AUTH_PASSWORD value in the command line in UnrealVS to the second credential name (Player2). Click Debug to launch the game again. When the second instance starts, you are prompted to authorize the Application for your second Account, and then shown the main menu.

  4. To ensure everything is working, click Browse to show the Server Browser, and check the game hosted by your first instance of the game is still running.

  5. Select the game. If you join the game successfully then the process is complete. You are now in a multiplayer game with 2 players(and bots).

Packaging LyraGameEOS

After you verify that EOS works in a development editor build, you can follow additional steps to create a packaged version of LyraGameEOS.

These steps only work if you followed the full process of installing Lyra into a copy of the engine built from the source code, as the launcher-installed version is not capable of customizing the build process.

  1. Set up your project in a Development build and load the editor to create a packaged EOS version of the game.

    You can clear the command line after the project name, UnrealVS will keep a history of command lines in the dropdown menu.

  2. Once the editor loads, Navigate to the toolbar, click Platforms > Windows > Build Target, then select LyraGameEOS to build a customized version of the game that bakes the -CustomConfig=EOS setting into the executable.

  3. Navigate to the Toolbar > Platforms > Windows > Package Project to choose an output directory. Once you select a directory it will start the cook and package process.

    Check the output log for any errors.

    If packaging Lyra fails and the log shows an error message related to UAT, you may be encountering a bug that was present in the original 5.0 release of the Lyra game sample. This can be fixed by downloading the Lyra sample for the 5.0.2 (or later) version of the sample or installing Lyra into a Samples/Games subfolder of your engine base install (C:\UE5\Samples\Games\LyraStarterGame).

  4. If the cook and package process succeeds, it places a packaged copy of the game in the directory you selected. This packaged build can be zipped up and sent to another computer for real-world multiplayer testing.

If you run this packaged build from the Epic Games Store, it passes the correct user credentials in. However, for development testing you need to make a shortcut or batch file and add the command line:

-AUTH_LOGIN=localhost:6666 -AUTH_PASSWORD=Player1 -AUTH_TYPE=developer

Next Steps

After following these steps, you now have a fully working version of Lyra usable for multiplayer development and testing using EOS. With a working version of an EOS-enabled Lyra Game sample, you can use it as a base for other development tasks with the eventual goal of releasing your game. To adapt the Lyra multiplayer code for another existing game, you can either build your game on top of the entire Lyra code base, or you can copy the CommonUser plugin and config files into your own game as described in the documentation.

Lyra was designed to work on all supported console, mobile, and PC desktop platforms, however, the current version of the sample was primarily tested on PC using an internal version of the Epic Games Store. To prepare for publishing your own game on the Epic Games Store, we recommend you work with your publisher to complete the Brand Review process and start a conversation with the publishing team.

If you need help developing a cross-platform version of the game or have issues with the EOS setup steps in this tutorial, you can create a discussion on the EOS Community Forums or contact EOS support.

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