Bluetooth connection
I have a pair of RHA TrueConnect earbuds. Just recently I found they failed to connect to my iPhone. I did a control test of the earbuds with my iPad and my wife's iPhone and they worked perfectly. That concluded that it might have to do with my iPhone bluetooth functionality. (note: I did a reset on the earbuds and set the bluetooth on/off on my phone but still not making both of them sync/work.)
iPhone 11 Pro Max