I have a TaoTronic TT-BH07 Bluetooth headset which works with the Fairphone 3 but not with the Fairphone 4.
It is not recognized at all.
The Fairphone 4 is the one I use daily.
The system is Android 12 with last update from 5 April 23.
Does anyone have an idea what it can be and how I can solve the problem?
Am grateful for any hints.
Thanks in advance.
Welcome to the community 
Does the pairing mode work in general? Or to put it another way, has it been working fine on the FP3 because you didn’t have to pair it in a while?
If you completely remove it from your BT devices on the FP3 and re-pair it, does it connect again (to the FP3)? 
According to the description on their website it uses aptx, so it might also be related to the Bluetooth issues introduced in a previous update
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Thank you for the quick answer.
I found how to connect it, so the first issue it’s resolved.
I’ve forgotten that I have to push a button on the headphone 
Now i have the problem with " No Sound".
As you said, the audio is a “aptX HD” .
I found this :
QAUOTE: … I changed the aptX profile to no and since then it works, afaik…
Can you tell me where I do that or there is a workflow for this issue?
I will check the links anyway.
After 10 minute reading and try I found the solution: in the “Developer Option” i deactivated the “HD Audio” and now it’s working.
Thanks for the help and the links.
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Should there be any need for further follow-up plese do so in the other topic linked above. I will close here to avoid duplication especially of the audio bug