Facebook has informed me that for violating the Policy of the Facebook platform 8.1, which says
Verify that you have correctly integrated the login. The application should not be blocked during the testing process.
The login is implemented with the PHP SDK and follows the example of the Facebook Developers documentation. At first glance, there is no blockage during the login (I have not programmed it). Has anyone had a similar problem? Touch for Facebook to unlock the app.