iOS mdm server certificate invalid error
iPads still running iOS 17.x have recently started seeing the following error during initial setup:
>“The configuration for your iPad could not be downloaded from xyz. The MDM server certificate for https://url/zdm/ios/otae/dobulkenrollment is invalid.”
Interestingly, both newer and older iPads running iOS 17.x are experiencing the issue after a wipe, whether the wipe is performed through MDM or via an iTunes restore.
All other iOS devices running iOS 18 and iOS 26 are enrolling successfully after a wipe.
The DEP token is valid, and these devices are enrolled through ADE. Has anyone seen this behavior? Any thoughts or suggestions on what else we should check?