The Autodiscover service couldn't be located. The Autodiscover service couldn't be located. (The Autodiscover service couldn't be located.)

Hello Team

Trying to migrate Mailboxes from Exchange online to Exchange Online via Quest ODM. Trying a shared mailbox for the first time. Created a shared mailbox in target tenant. Matched source and target using the display names and it was successful. 

Started the migration and the autoreply and allowed/blocked senders parts migrated to Target Mailbox. But then started getting errors like: "Could not locate mailbox using Autodiscover(Could not locate mailbox using Autodiscover)" and migration failed with errors. 

Cname records are present in both source and target in O365. 

In source its : Autodiscover.outlook.com 

Should we check in the source if its needs to be populated in their ISP ? 

What could have gone wrong. Can you please advice.

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