I have Exchange 2016 standard cu13 on a Server 2016 standard VM. I have one mailbox that will not migrate to a new DB. The log shows Transient Errors at 20% and the mailbox will go into quarantine until I stop the move-request. I can pull it out of quarantine using the Disable-Mailbox Quarantine <mailbox user> and the mailbox is stable in outlook, OWA and active sync. The database it's on had a hard repair and this is the last mailbox to be moved. I have run the clean mailbox command:
New-MailboxRepairRequest -Mailbox <user> -CorruptionType ProvisionedFolder,SearchFolder,AggregateCounts,Folderview
It takes a few minutes but eventually shows no corruption and 100% fixed. I get the same result.
In the past I've disconnected archived folders, shared mailboxes, forwarding, removed out of office messages and ended Rules in outlook to get past this issue with other stuck mailboxes. Not this time. Does anyone have a list of other things to try in order to get a mailbox to move?