Can not use video calling

Hello dear everyone.
I am jince
I am using jitsi-desktop in windows 10.
I register user with sip and try video call but i cannot see my video.
Now web cam is working well.
I cannot resolve problem.
Please help me
Thank you!

When it comes to video, the latest version has known issues. Therefore, are you using the latest stable version (currently: 2.10)? Do you get any error messages, when you start Jitsi Desktop from the command prompt?