Minecraft account migration issues, please help

when i migrated my microsoft account it made me pick out a new username when i signed in, i picked it and im not sure how to get the account back, the profile says nothing about migrating anymore

i have game pass btw

i tried signing in with a mojang account and it didnt work which makes me think the migration did happen but idk

tried signing out and in to he launcher and it signed me into the game pass account

:)