host unable to see me

On my macbook i can see myself my camera is working fine but when trying to join a meeting for my test my teacher is saying its not allowing them to see me on my screen it says the camera is turned on but theyre just seeing a black screen i have my camera, screen recording, microphone all turned on in settings and popups and redirects turned off so im not sure why its not allowing them to see me im not good with computers so looking for some advice