From a Pixel 3a: Sound notifications don't work well anymore. Vibration notifications are still fully functional. Tier 1's link only tells an end user how to turn on/off notifications. And I clear the app's cache frequently. Those educational tips were already in the Help Center, which didn't tell me anything I didn't know. I guess the next step is to check an end user forum, then create a famous Google ticket, which will get lost in limbo, then buy an iPhone, which is worse.