Nx8e communication failure

That Alarm.com trouble description is a bit misleading. To clarify, Phone Line Failure is a trouble condition referring to the landline phone dialer.

The landline dialer is not used with any Surety plan. Panel communication goes through the Alarm.com cellular module. If you see a Phone Line Failure message for an Interlogix system it usually means that you have account or phone number info programmed into the landline dialer/account programming sections. These are not needed.

To clear the error, try following the steps on this thread: