You can tap the third tab (gear icon) in bottom of the app to open the "Settings" page. You can see "No alarm triggered?" item a little bit down and tap it. There are two items to check. If they are all set, both would have a green check mark on the side, otherwise tap and follow the instructions. If it does still miss, set the diameter to 1000m of the alarm to compensate the accuracy of GPS to the area. Hopefully, the map alarm working fine for you and I could get a positive feedback. Many thanks for your feedback.

It seems that you have incorrect permission settings. You can tap the third tab (gear icon) in bottom of the app to open the "Settings" page. You can see "No alarm triggered?" item a little bit down and tap it. There are two items to check. If they are all set, both would have a green check mark on the side, otherwise tap and follow the instructions. If it does still miss, set the diameter to 1000m of the alarm to compensate the accuracy of GPS to the area. Hopefully, the map alarm working fine for you and I could get a positive feedback.