Facebook login message: “URL Blocked: This redirect failed because the redirect URI is not whitelisted in the app’s Client OAuth Settings.”

As the questioner writes

In the advanced tab, Valid OAuth redirect URIs is set to: …

and I had the same problem (writing the redirect url into the wrong input field) I would like to highlight that

It’s NOT

Settings -> Advanced -> Share Redirect Whitelist

but

Facebook Login -> Settings -> Valid OAuth redirect URIs

It would have saved me 2 hours of trial and error.

You should also have it in mind that
www.example.com is not the same as example.com. Add both formats to the redirect URL.

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