APP Access token are good and never expire but it didn’t allow accessing FB Pages with age/country restriction so you may need to generate a user access token
To generate it
2- Beside the user access token click the “Debug” button
If the screen at your side differs than the screenshot, you should create an app firstly. Check this on how to create an app then return to this tutorial
3- Now click the “Extend access token” button
4- It will ask for your password. Enter it and hit Enter and it will show the user access token to use at the plugin just copy and add it to the settings page.
Note: this access token must be renewed each 60 days.