It shows one of my friend's username VladBas02 when double checking before commencing Migration and when I go a few steps back to check Mojang profile info it clearly states my username correctly with it being Maarciel64. I have no idea how that's possible but I don't want to be stuck with a wrong name, specially because his profile is also legitimately bought and played on, with a different skin, server player history etc...
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Hi Aleksa, the screen showing "VladBas02" is the Gamertag which is attached to your Microsoft account you signed in with during the migration flow. if you do not want to migrate to this Microsoft account then you will have to pick a different Microsoft account to sign in with when you start the migration.
For account issues please contact Mojang support.