For anyone who might encounter this, check if your API key is working.
go to https://www.googleapis.com/webfonts/v1/webfonts?key=YOUR_API_KEY
after that make sure you have the following lines in your wp-config.php
define( ‘ACFGFS_API_KEY’, ‘YOUR_API_KEY’ );
define( ‘ACFGFS_REFRESH’, 259200 );
Then log out of wp-admin, and back in.
