- Using the internal bluetooth module (especially if you use wifi) is known to be troublesome. But still might work see my next two points
- Did you change the Audio Output under Settings → System → Audio (ALSA: Playback/recording through the PulseAudio sound driver)? If you done that HDMI audio will go away as soon as the Speaker/Headphone connects
- If your Headphone register as Headset there might be another step needed as explained here
Problem with bluetooth headphones - #29 by RobertJRussellLives
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