Verify the Azure AD objects exists and is not deleted, unlicensed, or is disabled.
Wait a day and then repeat what you had done before including removing the accounts from the project, re-discovering them, and re-mapping from File (if you are using a mapping file),
If that still does not resolve the problem, then next step would be to have the customer send the csv matching file they are using (if using it for account mapping). And a screenshot of the UPN, the 'Username' field for that mailbox from the target tenant Microsoft 365 admin center.
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