I published my app on google play store and it is using firebase phone authentication and firestore. At first some of my friends downloaded and used the app without problems, but later some new users complained about the error message on the below screenshot.
Since I am not testing on those phone, I could not find a solution for this problem yet. I searched this site and many on the Internet but those questions are about testing. As these messages get remote users who downloaded the app from google play, I could not find the solution for my situation yet. Please can someone help me to solve this?