grey screen with a white square

I'm facing same issue with a gray background and a white square in left bottom on my Series S. Yesterday, I attempted to play the old gen FC 24 (for Xbox One and PS4) and today, this problem affected the new gen FC 24 (Series S/X and PS5)
Must be a "zero-day" bug

My screenshot:

Bom dia achei uma solucao, quando vc for iniciar o jogo vc clica para jogar of line o jogo vai para tela de inicialização  aí vc pode escolher sua opção  de jogar e conetar normalmente 

Yeah, I did the same, press button on loading screen to avoid connect the account and the menu is opened as normal. 

Yes,there is solution: when the game is loading, cancel login to the servers(like you would like to play offline). If you want to fix the issue completely then try to repair the game. If this will not help then delete cache for the game.