I have no idea what I did, but I received a similar message on Monday 3/10/25. I had to go through a number of verification steps, but it let me back in. After I got in, X treated me as if I was a new user asking me to select people to follow. The dialog box wouldn't let me move on without selecting someone, so I did, but then, the continue/next button (I don't remember what it said) was greyed out and I was stuck. I logged out and then logged back in again and it was like nothing ever happened.