There are 2 possibilities;
- Either you responded "no" when asked to allow access to the phone's camera and microphone or
- The phone's settings were set to deny access to the camera and the microphone.
Solution: Go to phone's settings. Select Apps (Default apps, permission manager). Select Chrome. Select permissions (camera, location, microphone and storage). Select camera and click allow. Select microphone and click allow.
Note: In general, if you do have issues with accessing either your camera and/or microphone, you should check the settings and ensure that either they are set to ask permission for access (if available) or they are set to allow access.