Exchange on-prem migration to Exchange Online

André Barradas 21 Reputation points


I'm trying to migrate my on-prem mailboxes in Exchange 2016 to Exchange online using cutover migration.

The exchange activesync test is working.

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When i try to create the migration endpoint it gives me this error:

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I've enabled MRS Proxy in EWS virtual directory.

What am i missing to setup or where could be the problem?


Microsoft 365
Microsoft 365
Formerly Office 365, is a line of subscription services offered by Microsoft which adds to and includes the Microsoft Office product line.
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Microsoft Exchange Online
Exchange Server
Exchange Server
A family of Microsoft client/server messaging and collaboration software.
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  1. Yuki Sun-MSFT 40,911 Reputation points

    Hi @André Barradas ,

    Have you tried the options listed in the error message like changing the mailbox provided and see how it goes?

    If it doesn't work, it's suggested to try updating the password of the administrator account you entered when creating the migration endpoint and try it again.

    Furthermore, you can also take a look at the following article and see if you have missed any preparation tasks:
    Prepare for a cutover migration

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  2. Amit Singh 4,861 Reputation points