This is likely experiencing signaling issues due to the ongoing operations alert here:
There is an issue affecting some Verizon LTE modules causing failures at the carrier level. Alarm.com and Verizon are working on this now.
Enabling dual path by connecting the panel to wifi is recommended.
I would try powering down the system for 2 minutes, then power back up, wait a few minutes and run a cell test. Any luck? If not you are likely experiencing this carrier issue. It should be resolved without the need for additional troubleshooting soon.
Adding wifi will allow the system to communicate via broadband.
It does appear that your system was affected by the outage. Alarm.com has stated that Verizon is rolling out some updates to their system to resolve the issue we have been seeing, so it shouldn’t be much longer on that.
The module status not detected is an intermittent thing we have seen on GC3s for a long time, I would recommend powering down the system and physically swapping the cell module while the system is powered down if you have been using the Cell swap process in settings.