Funny, previously, I blocked Play Integrity API in the settings, but recently I reinstalled the application with Play Integrity API blocking disabled by default and the application worked correctly. I re-enabled API blocking as a precaution, but the Play Integrity API no longer triggers and I can't explain why. Perhaps there has been a recent change in the application's source code. It's good if the application no longer uses the Play Integrity API, but I can't confirm anything.