When I launch the Minecraft launcher it doesn't realize that I own Minecraft and will only let me in demo. However I was able to get in once since having this issue but I couldn't join any server with the error code of "null"
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Did this happen only after you migrated? I'm experiencing the same problem.
If you're experiencing this same issue, please see the highlighted moderator note attached toΒ MCL-16570Β for instructions on how to go about fixing this.

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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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Duplicates MC-207896 and MCL-16570. Please read the highlighted moderator notes within.