It looks like in recent 10 days, we have no sign up succeed from Facebook login, got many call back for below:

FacebookCallback.onCancel

We got app review request about 10 days ago, and received issue resolved notification after submit review request.

We reproduced this issue in our production environment, in a logged Facebook user App, it will got error like in attachment says the login was blocked. Users are forced to click cancel, so got onCancel callback.

The failures are keeping happening, this is blocking the signup from Facebook channel. could you help check ASAP? Thank you!