I just migrated my account and my kids account from mojang to microsoft accounts.Β
Now both of us only get access to the demo world in the launcher, and are asked to buy the game again.
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We're tracking this issue in MCL-16570, so this ticket is being resolved and linked as a duplicate.
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Duplicate of MCL-16570, which was later resolved as invalid because this is an account issue and the bug tracker is unable to help you. Please see the Mojang Studios note attached to the parent ticket to potentially fix this issue.