Bluetooth audio works good with my H800 headset and my car's audio, but my Oticon ConnectClip (bridge for audio through hearing aids) does not. The ConnectClip works works fine with my Linux laptops and my Pinephone (as well as an Android phone and Windows laptop), so it's not a general Linux problem. It connects to the FLX1 and shows up as an audio device, but the LED on the ConnectClip doesn't turn blue to indicate connected and audio doesn't go through. The ConnectClip is different from the headsets that work in that it will sync the volume from its volume buttons to the phone/laptop's volume, which also doesn't happen with the FLX1 but does with other phones/laptops. It doesn't seem to fully connect until the volume syncs, so I'm guessing it's stuck trying to sync the volume and never gets past that.