If you can’t go beyond the sign-in screen, select Forgot my password and follow the instructions.
So, if you encountered the Xbox Game Bar not working error, please check whether the game is running in full-screen mode.
Highlight the affected app title, and then select the Menu button. Drag the top slider to turn your device completely off. Right-click the program on the taskbar, and then click Move.
Certain Xbox 360 games will either not launch or immediately return players back to the home screen after launching.
please could someone help or advise what to do. Click the Search icon, type xbox game bar, and click Xbox Game Bar app.