When contacting HPE Technical support, the key information is whether the devices were able to associate to the AP - or not.
a) what changed weeks ago ? iOS updates ?
b) could it be the devices are also reporting "lock down mode" ?
c) Included in the AP tech-support :
show ap association
show ap debug mgmt-frames
show ap debug auth-trace
show log sys XXX | inc <client MAC>
If no association happens, likely an 802.11 packet capture is going to be needed to understand what is going wrong.
(Taken from the target AP, a nearby AP, or another device near the client device and the target AP)
If the association is happening, but the connection failing at a higher layer, the AP tech-support delivers more, we're then interested in the role assigned, and perhaps
the Apple Captive Portal Detect (CNA)
show clients
show ap debug client-table | inc <client mac>
Identifying whether or not association happens will help fill out the picture.
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Shawn Adams
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