Migration to M365 failed

Thanks for your information.

Some batches are now working again for me. However, I cannot say yet whether items were not synchronized correctly.

The migration will be completed over the weekend.

In addition, however, I had to create a new batch with around 8 mailboxes, which always resulted in an error:

SourceMailboxAlreadyBeingMovedPermanentException/FolderSaveException/PropertyErrorException: Error: Couldn't switch the mailbox into Sync Source mode. This could be because of one of the following reasons: Another administrator is currently moving the mailbox. The mailbox is locked. The Microsoft Exchange Mailbox Replication service (MRS) doesn't have the correct permissions. Network errors are preventing MRS from cleanly closing its session with the Mailbox server. If this is the case, MRS may continue to encounter this error for up to 2 hours - this duration is controlled by the TCP KeepAlive settings on the Mailbox server. Wait for the mailbox to be released before attempting to move this mailbox again. --> An error occurred while saving the changes on the folder "TwAAAAAbVfogqmYRzZvIAKoAL8RaCQBIAERSLUFEUy0wMS5kcnVtYWcubG9jYWwAIds5z5U8502Q9yVsmRyuHY8f4TDVWERIhZ3deG1cAzb/". Error details: Failed, Eigenschaft: [0x66180003] InTransitStatus, PropertyErrorCode: AccessDenied, PropertyErrorDescription: ''. --> Property: [0x66180003] InTransitStatus, PropertyErrorCode: System.Runtime.Serialization.TypeLoadExceptionHolder, PropertyErrorDescription: .

I hope they work again after a new creation.

After a day of waiting, the batches still did not work.

Greetings,
Phil