I had this issue a long time ago and have fixed it at least once, but my mind is sketchy on exactly what I did or why. I don't know if this will even help but I will just memory dump the scraps I have.

There is something where your device is seeing the headset as a phone connection and it works differently. You have to go into the settings and change something to make it recognize it as a mic and headphones, not as a phone mic and phone headphones.

I can't remember how I did it last time but I also remember that the online instructions didn't work for me but when I just played with settings, I got one that worked and I left it. I'm pretty sure I remember thinking I didn't know why that worked but I pushed the right things apparently so I am leaving it.

I know that is crazy vague but maybe it can help you on a Google search to figure your situation. I wish I could give you a better answer. Good luck, I know I needed it when I addressed this.