Facebook login: Please make sure your redirect_uri is identical to the one you used in the OAuth dialog

You can set redirect URI in Go to https://developers.facebook.com/apps Select your app.

Under Products > Facebook Login > Settings

You can Validate Redirect URI with Redirect URI Validator.

You can only use https URIs. Also set App Domain in Settings > Basic > App Domains

Try / at the end of redirect URI

In my case I was using https://localhost everywhere but somehow when getting access token specifying https://localhost/ worked.

I believed you have used different redirect_uri in your facebook app settings and Oauth API code. thats why you got this error.

For facebook login you must set same redirect_uri into both place.

As absurd as it sounds, verify you're using the correct app_secret.

Facebook will give you this instead of just saying "invalid secret" in the response

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