Enabling the mailbox was successful. But no data can be migrated.
The following are seen in the log:
DEBUG: OpenMsgStore for user returned: 8004011d, mdb=00000000
ERROR: [4970-24-52-8004011D]Unable to open mailbox for user 'email@example.com'
MAPI error 8004011D
Error: Error when logging in to Microsoft Exchange.
Component: Microsoft Exchange Information Store
Low level error: 80070057 Context: 00000512
Finished migrating user 'UserName'
You need to be signed in and under a current maintenance contract to view premium knowledge articles.