Microphone in the stream on Twitch not hear?

I've also started streaming (gaming) and I own a microphone and an audio interface. Everything is set correctly… OBS recognizes that I speak into my microphone and it also records it, means the volume level fluctuates back and forth. In the stream, however, you only hear the sound of the desktop, so the music via spotify and the game sound. You do not hear me, although then the volume level fluctuates back and forth from the micro. So the signal goes in, but in the stream you can hear nothing at all from the microphone… I would be glad about a helpful answer! 😊 Thank you in advance.

Did you activate the audio tracks in the Soundmixer?

(Only track 1 must be activated here or the track selected in the first settings (first screen), the other tracks are for recordings)

Thanks for your answer! However, I have already discovered the error a few hours ago, have clicked under audio settings Somehow 2 audio tracks, I then selected 1 audio track and it was 😂 but many thanks