Headphone doesn't work completely with FP2

Hello everyone,
Since a few weeks I have a faiphone2 and my Sennheiser headphones MOMENTUM on ear, with a cable RCG M2 for Android, does not function completely. The volume, the microphone … do not work. I can answer when someone calls me but my interlocutor can not hear me.
I do not want to change a headset that works, would anyone know if an adapter works?
Thanks for your help,

Here ya go, Ms Alucard:

Compatible headgear

A list of compatible ones with which all functions work.

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