If the wrong accounts are being linked, click Shift+Tab to close the Steam Overlay then from the Main Menu either click 'Sign Out' from the bottom of the screen or press the X key.

Selecting 'Yes, Link Accounts' will confirm that you wish to link your Xbox Live accounts and Steam profile.

Pressing 'Let's Play' will then open the Steam Overlay displaying a browser window asking for confirmation that the correct accounts are to be linked and whether you wish to proceed.

After entering your sign-in details and password you will be shown the following screen.

Once you click 'Sign in', you will then be prompted to then enter your Xbox Live account details.

When you boot Forza for the first time and progress to the 'Start Game' screen, when you attempt to progress past the screen a 'Sign in to Xbox Live' dialog box will be shown.Linking an Xbox Live account to Steam from within the game You can check that it is and also create an Xbox Live account if required by clicking here. Though you may have a Microsoft account already, your Microsoft account must also be signed up to Xbox Live. Below are the steps which are required to link as well as unlink your Xbox Live account when required. When you boot Forza through Steam, you will need to link an Xbox Live account to your Steam profile before you can enter gameplay.

Adding game pass games to steam