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Access denied error while migrating mailbox from Exchange OnPrem to Exchange Online

Anonymous
2022-01-06T15:23:29+00:00

Hi all,

I am experiencing migration problems, most of the mailboxes included in migration batches failed with the following error messajes:

Error: MigrationTransientException: The call to ‎'https://hybrid _server/EWS/mrsproxy.svc‎' failed. Error details: Access is denied.. --> The call to ‎'https://hybrid _server/EWS/mrsproxy.svc‎' failed. Error details: Access is denied.. --> Access is denied.

or

Error: TooManyTransientFailureRetriesPermanentException: The job encountered too many transient failures (61) and is quitting. The most common failure is CommunicationErrorTransientException/SecurityAccessDeniedException with the hit count 59. --> The call to 'https://hybrid_server/EWS/mrsproxy.svc' failed. Error details: Access is denied.. --> Access is denied.

Only 10% of mailboxes are able to be migrated, the remaining 90% failed with either any of the 2 error messages listed above.

Please advice.

Microsoft 365 and Office | Subscription, account, billing | For business | Other

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  1. Anonymous
    2022-01-07T01:30:05+00:00

    Hello MigueTurrubiates,

    Welcome to post here.

    Seems this issue is related with the backed server's resource limitation which caused the migration slow or stalled. Could you please open a support ticket (supposing you are the global admin) from the Microsoft 365 admin center > support > new a service ticket to double confirm with our backend team? Or please wait some time to try again.

    Please don't hesitate to update us if you need any helps here.

    Have a nice time.

    Regards,

    Rudy

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