Story: I have two Minecraft accounts (I used to do plugin work and it made testing easier to have an alt.).

I migrated my main one to my MS account (one that's been in use with xbox and O365 for a decade+ at this point), no problem.

I migrated the second one to a new account a few weeks back after they pushed that it'll be mandatory after 10th March; usied a gmail address for the new MS account because I'm done dealing with outlook.

It all worked, for a week.... I'm now locked out of that second account, with them demanding a mobile number to "verify" it's me...

I haven't had the energy to go yell at them yet. It's the same bullshit I hear happens with twitter accounts where they also demand a mobile number.

The truth is I think my "primary" account has my mobile number already attached... and I'm scared that I'll lose access to that as well if I try to use it to unstick my second account, getting "auto-banned" in much the same way they described my second account (which ONLY ever got used to login to Minecraft) for suspicious automatically detected activity and violation of TOS.