Hello,

Sorry for the inconvenience, Due to recent data leak issue of Facebook in media, they have temporarily disabled some non-active accounts. They are taking some security checks and reactive them.

This does not issue with plugin or code but as Facebook has inactivated your app so we need to wait till they are reactive or suggest an alternative solution.

You can find a detail blog post Here about the same.

We are keeping a close watch on issue and update blog post as soon as we have something or Facebook update on it.