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Title
Microsoft.Exchange.WebServices.Data.ServiceResponseException: Access is denied when trying to sync a Calendar or Mailbox -
Description
Error 'Microsoft.Exchange.WebServices.Data.ServiceResponseException: Access is denied. Check credentials and try again' appears when attempting to sync a mailbox or calendar using Migration Agent for Exchange (MAGE). -
Cause
The NT Authority\Self permission is missing from the mailbox. In it's place is an invalid SID. -
Resolution
Re-add Full Access and Send-as permissions for NT Authority\Self
Sample Scripts to re-add the appropriate permissions:
Get-Mailbox -ResultSize Unlimited | Add-MailboxPermission -User "NT Authority\Self" -AccessRights FullAccess
Get-Mailbox -ResultSize Unlimited | Add-ADPermission -User "NT Authority\Self" -ExtendedRights Send-As, Receive-As
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Additional Information