I use the Libre app on my iPhone to start the Libre. Afterwards, my Glimp and X-drip apps are on my android, and although I've seen that error message, it's never affected my sensor in 12 months of using it. Try scanning the removed sensor as a test when it's off your arm. My scans after it's removed. If it scans then it was probably another issue.
If your sensor is dead, in the Glimp app, if you go to options, setting, list of compatible devices, and you may want to check if your phone model is there. (Mine is on the list of non-compatible devices but still works. I also use MM.)
Good luck.