I've got following issue after moving some mailboxes from 2010 to 2016 (CU17, Windows Server 2016).
Does someone already faced this and find a way to avoid this?
Step : migrate users from one 2010 database to a 2016 database.
Result : some users (a few) have 401 denied or 302 redirect answer from autodiscover. I'm not able to explain why (I've not noticed anything in the log).
Workaround I've found :
503 solved after moving again mailbox from one Exchange 2016 database to another
Databases are in a DAG.
Thanks in advance for your help!