I play Fortnite (PC) and noticed that my micro does not work, although it did this earlier.
Check connections?
Windows looked at whether the microphone in the recording devices even indicates a level?
Looked at Fortnite if you can change the microphone?
Microphone possibly muted?
Can you control the volume of your microphone via a sound card integrated in the cable?
does your microphone work in another program?
The headset tested on another PC?
Questions about questions
So it is not mute because I can't feel my headset my sound was as far as possible set
The micro works in discord
See if you can change your micro input in the sound settings. Also, ask what your microphone is called and match it with your current input in Fortnite to be able to change it. Then it should work. If not, try turning push-to-talk off and on with the general Fortnite voice chat.