Players found a solution themselves while the developers are figuring it out.
The update released on November 11 for Battlefield 6 "broke" the PlayStation 5 version. After installing the patch, players cannot access any mode - neither multiplayer nor even the campaign. The game requires installing missing files, even though they are already present on the console.
The developers are aware of the issue and promise to fix it as soon as possible, but players have already found a solution themselves.
On the PS5 home screen, highlight the Battlefield 6 icon, press the "Options" button, and select "Restore License." After that, the console will prompt you to download additional data packages. Then just restart the game.