This happens when the APN certificate expires or something was corrupted. Is the device enrolled in DEP? If not, it it simple to just remove the profile and Meraki MDM app and re-enroll via m.meraki.com. Support will probably inform you to re-enroll the device. If it is enrolled in DEP it is tricky: -Take a backup of device A (the iPad that hasn't communicated) -Restore the backup of device A on another device "device B" enrolled in DEP -After restoring, make a buckup of device B -Restore backup of Device B on Device A Simply taking a backup and restoring that backup on the same iPad is not possible (DEP enrollment will not come down!). While wacky, this is the only patch that works.
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