Xbox, cant start a game from gamemenu

Downloaded the game on Xbox series X. the filesize is 26GB. The game starts and I get into the menu. But when trying to play, the play button is greyed out and a red message says that i havnt downloaded the content for this experience. There is no content waiting in update/downloadqueue, I have enough space on hard drive. There is no other otpions to download anything - or start the game.
What am I missing? Am I beeing stupid here or is it a bug? PLS help! Any other had this problem?