Same here but with the added pain of an early "onmicrosoft.com" account that splits our users between their domain and ours, doesn't let me use my work domain address, and yet denies the onmicrosoft.com one access because it's not a "work or school account".

It's seriously bemusing to be logging in to an organisational account with admin access only via a personal Gmail account username but there's literally no migration path for these early adopter accounts.