I have a Galaxy S21 Ultra that almost a year ago audible notifications stopped working... except when connected to Bluetooth or during certain games. I've read a ton of threads and tried many suggestions. I've even factory reset my phone after an Asurion tech looked at it and couldn't figure out the issue. The kicker is that if you go into notification settings to preview or select notification sounds they don't work either... unless connected to Bluetooth. It's driving me crazy.