How to enable microphone and camera for video chat on iPhone 16 Pro Max?

If this is with a 3rd party app, open the Settings App. Scan down to Privacy & Security and tap it. Look for Microphone and tap it. See if the app is listed and if it is tap it to grant access to the microphone. You can also grant access to your camera and photos in the same settings are for apps.

You must go to Settings > Privacy & Security > Microphone and grant access to the app. Do the same for the Photos menu. Apps must explicitly request access to these specific functions for them to show up. If you do not see the apps, try deleting and reinstalling the app, and you will be asked again upon download.

Hope this helps, take care!