In the latest Telegram Android, the Telegram server may request the client to do a Play Integrity check at any time with error code INTEGRITY_CHECK_CLASSIC_X, then the client will perform a Play Integrity check and resend the request with the invokeWithGooglePlayIntegrity method.TLDR: Telegram can check whether you are using genuine Telegram app on a "genuine" Android device at any time while you are using the app.

In the latest Telegram Android, the Telegram server may request the client to do a Play Integrity check at any time with error code INTEGRITY_CHECK_CLASSIC_X, then the client will perform a Play Integrity check and resend the request with the invokeWithGooglePlayIntegrity method.

TLDR: Telegram can check whether you are using genuine Telegram app on a "genuine" Android device at any time while you are using the app.