Can you hear me very quietly on my girlfriend's Twitch stream?

I have a question. A friend and I often stream Call of Duty on Twitch, but the problem is, I can only be heard very quietly on their stream. I have to say that we're talking about the Ps4 party. With my stream you can hear both of them very well, only with hers I'm completely quiet. I have my microphone volume at the loudest and she also has the voice chat very loud. Do you know why that is and how you can make me louder? We have tried everything, but we do not get any further.

So your microphone sensitivity is as high as you can how did you connect the microphone with me at the ps4 I tried 2 usb sound cards, one of which comes from the microphone, the other does not have enough power which is why the microphone only worked minimally