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Facebook social auth failing for App Store reviewers (React Native)

Hi there,
I seem to be facing an issue that has only come up recently. Have had social auth (facebook) running smoothly for over a year now. Apple in a recent app update review are reporting they are having trouble logging in with Facebook. Getting the Failed Login invalid_request error “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.”

The logs reveal the same information, however interestingly i did notice no connection strategy listed in the log entry for the Failed Login.
I’ve temporarily turned off Brute Force protection to see if its related.
Naturally all my testing and that of the existing user base yield no issues … only Apple Reviewers, had them retry a few times now.

Nothing in my logs revealing the same error except that which is in line with the Apple Reviewer’s attempts.