Mediasoup-demo video is not showing local

Hello, i know there are already some questions about this. The application is working and when i enter one room with 2 tabs, i see, that both are in the same room, but the video from the other peer is not showing, only the own video in the left bottom corner.

I am running the application on localhost.
I have windows, but i am running the app and the server in Ubuntu-WSL, maybe there have to be some extra port or ip configurations ?
Following i use fpr the webrtcTransportOptions and also tried several ips as annpuncedIp and nothing worked.
ip : process.env.MEDIASOUP_LISTEN_IP || ‘’,
announcedIp : process.env.MEDIASOUP_ANNOUNCED_IP

Does somebody know something i can try ?