Title: Admins are unable to complete some cross-tenant mailbox migrations in Exchange Online
User impact: Admins may be unable to perform tenant to tenant migrations and offboarding moves in the Exchange admin center.
More info: While we work on developing a long-term solution, admins may be able to use PowerShell for the affected migrations and moves with the following cmdlet against the affected mailboxes:
Set-MoveRequest "user@yourdomain.com" -SkipMoving FolderRestrictions
Next, the tenant admin may have resume the move request using the cmdlet:
Resume-MoveRequest "user@yourdomain.com"
This would allow the affected move jobs to continue to make progress.
Admins may be able to run the following PowerShell cmdlets sequentially for migration batches:
Set-MigrationBatch batchname -SkipMoving FolderRestrictions
Start-MigrationBatch "BatchName"
Admins attempting to complete a tenant-to-tenant migration or an offboarding move in Exchange Online receive the following error
"PropTagToPropertyDefinitionConversionException"
Current status: We've received reports that impact associated with EX1232513 persists. We've resumed our investigation of the issue and have developed and are validating a fix to remediate impact.
Scope of impact: Some admins attempting to perform tenant to tenant migrations and offboarding moves in the Exchange admin center may be affected.
Start time: Saturday, February 14, 2026, at 12:48 AM UTC
Root cause: A change introduced a code regression to Mailbox Replication Service (MRS), which is causing intermittent failures for tenant-to-tenant migration actions or offboarding moves as the property tags needed to complete the request are not being properly configured.
Next update by: Wednesday, August 12, 2026, at 1:00 PM UTC