Saying "cannot join realms/servers"

The error code reads something along the lines of "cannot join reals or servers because of how account is set up" but it was working before so I thought maybe something change so I basically allowed all my settings and still didn't work. I got on with Microsoft support we tried everything for about 45 mins he sent me to mojang support and the person I was chatting with believed it's a bug. So that's why I'm here now and I'm not sure what to do.