HTTP 451 Redirect Compatibility (specifically iOS 9+)

[Ivan Unger]

Hi, can someone point me to somewhere, where I can find more details about supported configurations/devices for HTTP 451 redirects?

We have

• Exchange 2013 CU13 onPrem
• Exchange Online Hybrid Configuration with ADFS SSO (AAD Connect)
• with mailboxes moved from onPrem to Exchange Online
• iOS Devices with iOS9 and iOS10

What infrastructure parts do really have to support HTTP 451 redirects in order for a moved mailbox to automatically reconfigure in iOS9/10 (integrated Mail/Calendar/Contacts App).

Also, does anyone know which EAS Versions are shipped with iOS9 and iOS10, as this also seems to be a limiting factor.

[#2 · Accepted solution]

Looks like my scenario is working. I just didn't work for me, because I had MFA active and iOS Mail wants an app password after the mailbox move.