Yup on the Web will require permission to use your camera. You will get a prompt asking for permission and if you click No, you will get this error:
Your webcam is blocked. Unblock it in your browser settings to take a picture.
To fix this, click the little camera icon to the right of the URL bar:
Choose “Always allow https://student.yup.com to access your camera” then click Done.
Refresh the page. Your camera should work now!