I’m not seeing any Surety subscription tied to this user. So that we can best assist, what model of alarm panel are you using?
Offline is a common status with a variety of causes. Read more here:
That status is the panel confirming that signals have been missed from that sensor. If the battery is removed, this condition cannot be resolved as it will no longer communicate at all.
You would need to remove it from programming to resolve the Offline condition if the sensor is no longer functional.