Let's try to refresh your list of friends. Please follow the steps below:
1 - Log out of Facebook in the game
Go to the Settings and Tap the Log Out Facebook button
2 - Go into your settings in Facebook app
You can get there by pressing the arrow next to your picture in the upper right corner.
4 - The first line is "apps logged if with Facebook". Press that.
5 - Select Cradle of Empires
Please check the following settings:
- Visibility of app is Public
- Public profile is checked
- Friend list is checked
Scroll to the bottom and you will see an option to remove app. Choose it.
6 - Open the game and log back into Facebook. Facebook will ask you the standard permission questions.