I have already migrated several thousand accounts from on premises to Exchange online/Office 365, but I now have one account that is repeatedly failing. I have cleaned up the mailbox, removed recurring appointments with no end date etc. but I still get this when I try to sync it.
Error:MigrationMRSPermanentException: Error: The job encountered too many transient failures (72) and is quitting. The most common failure is CommunicationErrorTransientException/CommunicationException/XmlException with the hit count 60. --> The call to 'https://mail.domain.com/EWS/mrsproxy.svc server.domain.com (15.0.1365.0 ServerCaps:, ProxyCaps:, MailboxCaps:, legacyCaps:0400001F7FFFFFCB07FFFF)' failed. Error details: Server returned an invalid SOAP Fault. Please see InnerException for more details. --> Unexpected end of file. Following elements are not closed: MessageData, InnerException, MailboxReplicationServiceFault, Detail, Fault, Body, Envelope. Line 1, position 65537.. --> Server returned an invalid SOAP Fault. Please see InnerException for more details. --> Unexpected end of file. Following elements are not closed: MessageData, InnerException, MailboxReplicationServiceFault, Detail, Fault, Body, Envelope. Line 1, position 65537.
This is the only mailbox giving any errors, All remaining mailboxes are synced ready to complete the migration or have already migrated.
When I search for invalid SOAP errors I get lots of hits but nothing that matches the issue I have.
Anyone have any idea what needs to be done to get this account migrated?