We are using an Auth0 hosted custom login page. The page uses the latest Auth0.js library (v.9.8.2) and we use the webAuth.authorize() method for facebook logins.
This worked consistently for us for over a year but suddenly stopped working in early November (Nov 12 possibly).
Now, when we login with facebook , instead of being taken to the page specified by our redirect uri, we get the Auth0 error page:
_Oops!, something went wrong _
You may have pressed the back button, refreshed during login, opened too many login dialogs, or there is some issue with cookies, since we couldn’t find your session. Try logging in again from the application and if the problem persists please contact the administrator.
Login works as expected when we already logged in to Facebook(so after the first attempt it will work fine).