I have a replacement pair of Jaybird Freedom 2s after the first set broke.
I have connected these to my main phone (Android Blackberry Key2), the audio works but no microphone. The old Jaybird Freedom 2s microphone worked on this phone.
I have tested the new headphones on another phone (Moto G5) and the microphone works.
I have started the Key2 in Safe Mode, checked the microphone permissions. I have also reset the Jaybird headset.
So, the microphone hardware of the Jaybird headsets work.
Why does the microphone not work? Is there anything else I can try?