In a Microsoft Exchange Server 2010 hybrid environment, you try to on-board or off-board a mailbox through Exchange Online. If you use Exchange Server 2010 as the MRSProxy service, the migration ends unexpectedly and errors are reported.
For example:
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When you on-board a mailbox to Exchange Online, the status is displayed as CompletedWithWarnings. This results in the mailbox existing in both locations.
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When you off-board a mailbox from Exchange Online, the move status is displayed as Failed because the migration was unable to convert the target MailUser to a mailbox.
Additionally, the following error is logged in the move report:
Message: Warning: Unable to update Active Directory information for the source mailbox at the end of the move. Error details: An error occurred while updating a user object after the move operation. --> The type initializer for 'Microsoft.Exchange.Configuration.Tasks.TaskLogger' threw an exception. --> Access is denied.