I am getting the same error.
I have added https://bazaar.city and https://www.bazaar.city on my URI redirection however still getting the same error.

Can someone please help me?
I tried the below but it does not take the complete url.
https://bazaar.city/index.php?page=custom&route=fblauth&fbLogin=1

This the error:

 URL Blocked: This redirect failed because the redirect URI is not whitelisted in the app’s
 Client OAuth Settings. Make sure Client and Web OAuth Login are on and add all your app domains as Valid OAuth Redirect URIs.
 
thanks for any suggestions!

@bengalliboy
URL Blocked: This redirect failed because the redirect URI is not whitelisted in the app’s
Client OAuth Settings. Make sure Client and Web OAuth Login are on and add all your app domains as Valid OAuth Redirect URIs.

Not quite sure what else could be said.
Btw. https://bazaar.city/index.php?page=custom&route=fblauth&fbLogin=1 gives you error 404