Bose NC 700 - Can't connect to iOS app or reset device BT pairing list
At some point in the last few weeks, my iOS Bose Music app stopped seeing/controlling my Bose NC 700 headphones. I have tried uninstalling and reinstalling the app and also deleting all devices from the app, to no avail. It seems the app is aware of the headphones, since they show up when I tap to add a device ("Get Connected") but after tapping on my device, the cursor just spins for a minute and then I get the error "Connection failed / please try again."
I've also tried to reset the headphones in various ways without success. I understand you're supposed to be able to clear the pairing list by pressing and holding the power/BT button for 10 seconds. When I do this, I don't hear any voice prompts, just a sound that ping-pongs back and forth between the left and right ears. This does not appear to actually clear the pairing list from the headphones. I've also tried turning off the headphones, and then pressing and holding the power while plugging in an power-connected USB-C cable, again to no avail. No matter how long I hold the power/BT button or fidget with different combinations of power cords, I can't get anything to reset on the headphones or any voice prompts to tell me what is going on.
Aside from all this, I can play music from my iOS device to the headphones fine, I just can't use the app to change any settings on my headphones.