Certain people can't see my webcam but others can

I can see some peoples webcam and hear them through the mic. But others cannot see me nor hear me. Why is this?

Hi… how many people do you have in the room?

Just a quick follow up on this… we are now testing a new webcam system, which should greatly improve the reliability. Would be great if you could have look and try it out!

Some people still have this issue in my room. They have to refresh to cam

Is there anyway you can boost the cam limit to 20 also btw? I think It would be a more reasonable limit than 4