Focused folder keeps disappearing

I'm using Office 365 on Windows 11. I got used to the Focused folder until a couple of days ago it disappeared. I've tried to get it back, but the "show Focused Inbox" disappeared as well. I created a new profile, I added the button to the ribbon, and it's not working. the button starts up greyed out.

I have 4 accounts on my Outlook and it seems that the Focused folder works for 2 of them and not for the other 2, although it worked for all until a few days ago.

Any idea?