...when users get moved from on-prem to O365, their mobile device ActiveSync profile should get automatically updated and they should have nothing to reconfigure on their mobile devices.
However, this doesn't seem to be working; the engineer working on this says that it's because of ADFS; he says:
"it looks like all Active Sync historical profiles must be recreated to point directly to Cloud following the Cloud mailbox move event. Currently, I am not aware of any main stream way to get the existing On Prem Active Sync profile to continue working after a mailbox move to a Cloud ADFS front ended configuration"
True or not? If not, then any ideas what the issue could be?
I can see people are saying it worked for them but sometime it takes for redirection to work however for me it never worked and I have to recreate the profiles. While searching on this I found below article which says we have to check device prefixes are known to Exchange or not.
Could you please check IIS logs of an Exchange Server 2013 Mailbox server, whether exchange server attempted to perform the redirection or not, if it performed to do the redirection than we have to check the device compatibility whether device supports Exchange ActiveSync 451 redirection or not.
If you found solution working with MS- please let us know as well.