To have a call on iOS devices, you need to provide access to your webcam and microphone. Safari requires you answer this each time.
Press "Allow" when prompted.
If you do not see that prompt, you may need to specifically enable camera and microphone access in your iPhone or iPad device's settings:
Scroll down, and select Safari.
At the bottom, select Camera and set it to 'Allow.'
Do the same for Microphone.
You may also want to:
Make sure you are not in private mode in Safari 11+
Ensure your iPad doesn't have the zoom feature enabled
If you are still unable to see yourself in the video feed, do the following in order:
Restart the Safari browser app
Make sure your camera works with FaceTime.
Make sure there is nothing blocking the camera and is clean of any dirt or smudges
On iOS 13 and up, you can also set the camera and microphone to be enabled by default
Go to Settings on your device
Scroll down and open Safari tab
Ensure Camera & Microphone are set to Allow
Make sure Request Desktop Site option is turned off
How to give access to Chrome to use your Camera and Microphone on Android Devices
Use your camera & microphone
You can use your camera and microphone for sites in Chrome.
On your Android device, open the Chrome app .
Go to a site that wants to use your microphone and camera.
When prompted, tap Allow or Block.
Allowed sites: Sites can start to record when you're on the site. If you're using a different Chrome tab or a different app, a site can't start recording.
Blocked sites: Some sites won't work if you block them. For example, you won't be able to join a video conference.
Change a site's camera & microphone permissions
On your Android device, open the Chrome app .
To the right of the address bar, tap More Settings.
Tap Site Settings.
Tap Microphone or Camera.
Tap to turn the microphone or camera on or off.
If you see the site you want to use under Blocked, tap the site Access your microphone Allow.