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ElementITFlag for United States of America

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Exchange 2010 to Exchange online hybrid migration

Hi, we are starting an O365 migration from an on-prem Exchange 2010 server. I am trying to create the migration endpoint and get the error below.

We couldn't detect your server settings. Please enter them. AutoDiscover failed with a configuration error: The migration service failed to detect the migration endpoint using the Autodiscover service. Consider using the Exchange Remote Connectivity Analyzer ‎(‎ to diagnose the connectivity issues.
Remote MRS proxy server:
The FQDN of the Exchange server that the Mailbox Replication Service (MRS) Proxy is on. Autodiscover tests pass. https://<exchange fqdn>/EWS/mrsproxy.svc connects. But, I cant get the endpoint to create.
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Vasil Michev (MVP)
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Make sure your firewall is not blocking the connection and you have a valid 3rd party certificate assigned. And/or try to manually create it, bypassing autodiscover.
Here is the very similar issue with suggested answer-
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mac carter

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