The Missing status listed for the SIM card suggests the underlying issue. That indicates that the panel cannot tell a SIM is connected. This has come up a few times in the past with Edge panels, each of which required replacement I believe.
So that we can best assist can you please send us a private message with the Serial Number (the actual panel serial number, not the IMEI) from the sticker on the back of the panel? 2GIG requires this info.
We can then report it to 2GIG and see if they have other recommendations, and if not, you can reach out to the vendor where this was purchased for warranty details.