same problem. opened a ticket with dev support but they never have any clue.

This is not a "red herring". We are having devices fail on this as well. The failing iPads go through a 301 redirect when attempting to hit Apple’s PPQ verification site. When trying to GET from https://ppq.apple.com/v1/connect , the device is redirected to ppq-ext.v.aaplimg.com, causing verification to fail. Devices that are not failing to verify our enterprise apps are not being redirected. ppqfail.txt ppqconnect.txt

This is not a "red herring". We are having devices fail on this as well. The failing iPads go through a 301 redirect when attempting to hit Apple’s PPQ verification site. When trying to GET from https://ppq.apple.com/v1/connect , the device is redirected to ppq-ext.v.aaplimg.com, causing verification to fail. Devices that are not failing to verify our enterprise apps are not being redirected. Take a look at the video and information here: https://www.dropbox.com/scl/fo/0k2v4bf7851trk8yql56r/h?rlkey=h2pmax86ccokytijzojmmpn4j&dl=0