Kindly follow the below troubleshooting steps to resolve the same.

- Click on the secure option or the lock icon which is at the left of the address bar.

- There you can find a flash, camera, popups, microphone, and notifications.

- Please keep it as "always allow on this site".

- Reload the page.

Kindly make sure your webcam working perfectly and select the actual camera from the drop-down list which is on the hardware test page. Post to the checks, refresh the page once and proceed. 

In case the issue persists, please reach us out to our support number +918067414716. Also, raise a ticket with a screenshot of the error. Click here to raise a ticket.