We've had 4 devices out of 1,160 that have exhibited signs of this problem. A couple of things that we've noticed; All 4 devices where on some iOS version older then 17.x They all would have had a profile blocking VPN On the last one, we tried installing a profile containing the certs and the profile would install but the cert never was available to trust. On the last one, the MDM profile was showing as unverified but the device had just checked in with the MDM a day or so before and in the MDM the expiration date looked fine. So far it's been 3 iPhones and 1 iPad that were affected With our devices being almost 100% remote, I've not been able to get a sysdiagnose log. We have found that the only way to recover is by doing an Erase All Contents and Settings.