06/05/2022 06:01:00 PM (BST)
Microsoft Reference : EX376606
NHSmail Reference : INC28841289
Issue Status : RESOLVED
Issue Description : Admins can’t complete mailbox migrations when onboarding and selecting the “Automatically complete the migration batch.”
More info : Impact is specific to admins leveraging the new Exchange admin center (EAC) experience. Those using the Classic EAC experience are unaffected.
The error message reads: “RequestStartAfterEarlierThanCompleteAfterException: The StartAfter time must be earlier than CompleteAfter time on the move request.”
While Microsoft are focused on remediation, as a temporary mitigation, admins using the new EAC experience can select “Automatically start the batch” to begin the migration, and choose to end the migration batch by “Manually completing the batch later.” Admins can also manually set the date and time under the “Complete the batch automatically after time” option to a time after the batch start time.
Scope of impact : This issue may potentially affect any of your admins attempting to complete mailbox migrations while onboarding and selecting the “Automatically complete the migration batch” option.
Final Update : 07/06/2022 09:24:00 AM – Microsoft verified via internal testing that their fix to address the code regression in the cmdlet utilized for facilitating mailbox migrations has resolved the issue.
Root cause : A recent update introduced a code regression to the cmdlets service, which resulted in onboarding issues when selecting the “Automatically complete the migration batch” option for mailbox migrations performed in the new EAC experience.
Next steps : Microsoft are reviewing their update procedures to better identify similar issues during the development and testing cycles.