For some reason, after first trying the ADB method, it worked flawlessly, but then very quickly broke, so that it wouldn't detect any known players, and by turning them off and on again on the list, the last seen time and app-specific settings would reset, but the app wouldn't be detected. I've tried a few things, messing around with the permissions, reinstalling the app, rebooting the phone, nothing helped. Now it outright cannot detect any players, not even Poweramp with it's MusicFX setting turned on. The phone is Samsung Galaxy M21, model number SM-M215F/DSN, Android 10.