After migrating mailboxes from Exchange 2010 to 2016 or Office 365, the Exchange Store Manager fails to scan the mailboxes or the Dataloader cannot connect to the journal mailbox.
The following error may be seen in the mailbox wlog:
14:20:32 WARNING: Error when get mailbox user@User.com
A few lines before this error the following line you will see Autodiscover = 0, if Archive Manager using Autodiscover this would be set to 1:
14:20:31 Connect string is 'autodiscover=0;email@example.com;server=EX2016
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