after I migrated my account it shows up as a null error whenever i try to join servers
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This issue is actually often caused by the Microsoft account migration, somewhere in your Microsoft account options you should be able to enable/disable multiplayer. I think it's in privacy settings but I'm not sure. It may also be due to what age you put when creating a Microsoft account because if you are too young it might stop you from playing. One way to get around this is join a Microsoft Family at https://account.microsoft.com/family/. Otherwise, try looking around your Microsoft account settings https://account.microsoft.com/. Other than that, I can't help. Good Luck!
Please see MC-207896 regarding this issue.