I have encountered a similar problem on Renesas + KF.
The problem (in my case) appears to be due to an error in the SCO routing related to the TI WL1837 adpater that caused a no audio transmission between the devices.
You can get more information here
Let me know if you find a match with your bluetooth adapter or if you have more information about it.
Greetings !
Fabrizio
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