Can’t switch the microphone one!

I did'nt know there was microphones that needed two plugs to work (one for power and one for sound).

The microphones I have found is either USB (power and digital sound) or 3.5mm plug (analog sound).

If I understand you correct you don't know of any USB-only microphones for X1. Do you know where I can find information about if there is one? Maybe the ones for Nintendo work or perhaps the ones for playstation?

I suppose the console need drivers for the specific microphone to make it work and I can’t find any information about this at all.

Reading your case I can leave you other suggestions that will help you with chat mixing

Switch to power saving mode in settings: Some users have reported that switching to power saving mode in Xbox settings can help resolve microphone issues

Check permissions in Xbox settings: Make sure your Xbox account has the appropriate permissions to use a microphone

Verify your microphone through login: Some microphone issues can be resolved by simply verifying your microphone through login

Is the headsets volume turned up and is the microphone switch tuned on?

You're should to use an external microphone mixer. It's cheap and useful, coz you can change the input level of few microphones without switching your attention to the PC

To everyone that apply: the iPhone has 3 microphones built into the device. The xbox app does not know this so it will constantly switch between the multiple mics. Furthermore, the speaker used on the iPhone is currently near one of those microphones.
By default apple automatically will turn off or on the speaker/mic to minimize feedback throughout the process. If you have a bluetooth headset with a microphone built in (for example AirPods or Beats studio’s) the app will no longer get confused on which
microphone to use because now it knows just to use your headsets microphone only.