@Greymagic27 "Is it possible to provide a screenshot of the error message it gave you?"I didn't make a screenshot of the message, sorry.
Make a 'New' account with microsoft on the launcher. And write down the same login stuff you used to migrate your account. Follow the instructions that follows after thatand you have your account back. This worked for me.
Rienks
@Greymagic27 "Is it possible to provide a screenshot of the error message it gave you?"
I didn't make a screenshot of the message, sorry.