I have a game that is built in multiple different Unreal Versions: 4.27, 5.3, 5.4, 5.5, and 5.6. I run each version of the game on an XBox. However, only the Unreal Version 5.6 fails with the XBox error code of: E_XBL_NOT_INITIALIZED, which should mean that XblInitialize was not called, but it was.
I have reached out to Microsoft/XBox reps and they are reviewing our logs, but they also asked me to reach out to Unreal, to ensure there isn’t something that changed.