In order for you to be able to use video calls, you must allow browser access to the camera and microphone. The instructions vary for different browsers and operating systems:
Google Chrome, Android: see instructions⎘.
Google Chrome, PC: see instructions⎘.
Google Chrome, iOS: see instructions⎘.
Safari, iOS: By default, Safari requests permission to use the camera and microphone. You can choose one of the options: "Allow" or "Cancel".
After choosing a setting, the permission (or denial) will be in effect until the moment you leave the site or reload the page. If you’d like to change your choice, just reload the page, and select the option that interests you.
Access can also be allowed without reloading the page. To do this, click on the “AA" characters in the address bar, go to the website settings and enable access to the camera and microphone:
In some cases, you need to allow Safari to access the camera and microphone. You can do this in your iPhone settings: Settings -> Safari -> Camera, Settings -> Safari -> Microphone.
Opera and Mozilla Firefox: In the address bar, click on the lock image and allow access to the camera and microphone: