New Migration Errors: ProvisioningFailedException UserPrincipalName being used already

Question

Hi

We recently migrated mailboxes to office 365 with a few errors which caused the migration to keep stopping and needing to click resume. We thought all boxes had been migratedfrom what we could see so deleted the batch. We have found some mailboxes are missing email in some subfolders so we are trying to run the cutover migration again to enable a resync of missing mail. All accounts are the same and no new ones have been created (as we are a school and on holidays for a few more weeks).

With the new cutover migration we are getting the following error on most accounts: 

Error: ProvisioningFailedException: The value "*** Email address is removed for privacy ***" of property "UserPrincipalName" is used by another recipient object. Please specify a unique value. 

It has this error but recognises previous syncs as it has a last sync date for each email address and a number listed in synced items so knows the right account.

Can someone please take a look for me or is there a sync team that can look in to the data for us please.

Many thanks

Greg

Answer 1

Hi Greg,

I notice the case is closed. Do you have any update on the case?

Regards,

Johnny Zhang