Can Teams Host Turn on My Camera?

The meeting organizer has access to meeting options that enable them to turn off the participant's microphone or camera. However, they won't be able to force you to turn ON your feed (just an option whether you can turn ON/OFF the video feed). Hope that helps.

Can the host in Microsoft Teams see what I'm doing?

If you're using a personal computer, Microsoft Teams cannot see what programs and apps you're running on your device. It cannot monitor your computer activities. In other words, Teams can only track what is done within Teams.

Can Teams see your camera?

Inside the Devices screen, click on the 'Make a test call' option under the 'Audio devices' section. Teams will now show your camera feed on the main meeting screen and later as a thumbnail at the bottom right corner.