Admins may be unable to perform cross-geo Exchange Online mailbox migrations

Title: Admins may be unable to perform cross-geo Exchange Online mailbox migrations
User impact: Admins may have been unable to perform cross-geo Exchange Online mailbox migrations.
More info: This problem may have occurred when performing migrations using the Exchange admin center and PowerShell.
Final status: We’ve applied the settings change to correct the null reference and reset the user migrations, after which, we confirmed that impact is completely remediated.
Scope of impact: Any admin attempting to perform cross-geo migrations may have been affected.
Start time: Saturday, January 6, 2024, at 1:00 AM UTC
End time: Sunday, January 14, 2024, at 9:09 PM UTC
Root cause: A null reference in data transformations caused failures in specific migration scenarios.
Next steps:
– We’re reviewing the validation procedure for the recent change that introduced the offending null reference to identify methods of detecting similar issues before they cause impact in the future.
This is the final update for the event.