Experience high-fidelity audio in Microsoft Teams

Hello, I am so sorry, it looks like I missed a bunch of posts again! Please see my answer below:

Lode_De_Raedt We don't current support high fidelity mode forced by organizer. The send side controls whether high fidelity mode is used, the receive side does not need to select high fidelity mode to hear high fidelity.  Can you please let me know your usage scenario as for why you want this mode forced by organizer?

Doogiechap The music detect is only a reminder for people who are not aware of the high fidelity mode. As a frequent user, the best route is for you to turn on music mode when you know you will be sending music. Go to settings->devices-> select high fidelity music mode, this will make the button appear in your menu during the call. In the call, go to ... more, select "high fidelity music mode". 
ChristophAA now I understand what you mean for using stereo. That's an interesting use of the stereo mode. In principle, adding left and right channels are not a good practice because it will "color" the sound and create unnecessary nulls in the frequency spectrum. Although I agree in your case it serves the purpose, but in general, you voice is distorted and colored. The best practice is for you to switch device as needed at this time. We are looking into ways to help user improve device selection automatically. Stay tuned!