my bad, drop the sudo,
pactl list sources short
pactl set-card-profile <n> a2dp_sink
If you have a chance, can you please run bluetoothctl then once in bluetoothctl
info AA:BB:CC:DD:EE:FF
Where AA:BB:CC:DD:EE:FF is your headphones mac address. this will give a bit of output, part of which will be a UUID: table, just curious to see if Headset shows up in that list before Audio Sink.
Forget that, Just saw in your earlier post,
00001108 < 0000110b
So the Headset Profile is connected first, then the Audio Sink.