Problem with search domain and dns suffixes not being set on iPad/iPhone - iOS 14.x

Hi all,

Have noticed that our iPads that are running iOS 14+ are not showing a search domain (DHCP Option15) under the network settings. These are connected to our corporate Wifi. Also, I'm unable to get dhcp option 119 to work (yes, i'm using hex) on either 13.x or 14.x. This is with windows server 2012r2 and also a cisco IOS router. I can see windows machines receiving and setting both of these options successfully and also wireshark tells me they are being sent in the DHCPOFFER.

Obviously, if we use the FQDN for our internal hosts it's all fine but it's an issue for things like Canon Business Print where end users just want to use the short printer name.

Has anyone else experienced this issue? Any fixes or work arounds?