Usually, the *meraki.com certificate doesn't impact the check-in functionality and is only a part of new device enrollment. To investigate further I suggest ensuring the Apple push topic matches on the iOS devices and dashboard. Dashboard - org > MDM > Apple push topic iOS device - Settings > General > Profiles & Device Management > Meraki Systems Manager > Tapping on ‘more details’ > Mobile Device Management > Topic. If it is not matching you will need to have it match. This may involve reverting the push topic and then renewing it - If this is not an option, it may be required to re-enroll the iOS devices.
... View more
