What is permission manager in Android phone?

The idea behind this Permission Manager hidden in Android 4.3 is to give you control over what permissions apps are allowed to have . So if you don’t want Facebook to see your call logs, you can tell it to stop. As Android Police reports, this hidden feature is actually accessible to anyone who is running Android 4.3.

Read more

Why are my app permissions not working?

Reset All the App permissions, it may be that an app or apps or something connected is causing the issue . Go to Settings > Apps & notifications > see all apps > select three dots > Reset app preferences. Then reboot. This will not delete your apps data but you will have to provide permissions for all your Apps again.

Read more