What watchpoints can be ruled out? Select each box and make a selection, then submit.
Select/bind EMM – Is the enterprise still bound so that managed configurations can be pushed?
Set device policy – Are any policies interfering with connectivity? Are the correct certificate(s) on the device, if needed?
Set managed config – Is the managed app configuration correct? (e.g. server URL, sync window, etc)
Update apps/device – Did the Exchange environment, the Gmail app, or the managed app config change recently?