I've had problem login in on the launcher, saying i didn't write down the right login things while i did. It was saying that i needed to migrate the account or write the correct stuff down. Today, 12-9-2021 (dd/mm/yy), i was done with it and made a 'new' account with the same login stuff as i have migrated. It said that my account was blocked after migrating. It is fixed now.

So what i wanted to say is that after you migrate your account it may be possible that your account is blocked. It is no problem, just make a new account with the same login stuff, get the code, write it down and you have your account back.

As i said, i fixed it. But i think this is a bug.