Hi,@X-Box-11-2021
Thanks for posting your question in the Microsoft Q&A forum.
Based on your description, I suspect there may have been an error in your migration process. Did you add the TXT record for the DNS hosting provider, if yes, you may need to wait 72 hours.
For more information about how to migrate Gmail to M365, Microsoft has provided official documentation:https://zcusa.951200.xyz/en-us/exchange/mailbox-migration/migrating-imap-mailboxes/migrate-g-suite-mailboxes
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