"Error validating verification code. Please make sure your redirect_uri is identical to the one you (truncated...)

I'm using Laravel/Socialite to generate a login for Facebook OAuth.

That URL is <my domain>/auth/facebook?appUser=a@b.com

As a means of "stabbing in the dark" i've added the following Auth redirect URIs into the Facebook app:

http://<my domain>/auth/facebook/callback

http://<my domain>/auth/facebook/callback/

http://<my domain>/auth/facebook/callback?appUser

http://<my domain>/auth/facebook/callback?appUser=%3F

http://<my domain>/auth/facebook/callback?appUser=%2F

http://<my domain>/auth/facebook/callback?appUser=%3F%2F

But once the Facebook login happens, i'm redirected to:

http://<my domain>/auth/facebook/callback?appUser=a%40b.co.uk&code=<code>

and the above URL then generates an error of Error validating verification code. Please make sure your redirect_uri is identical to the one you (truncated...)

I have tried urlencodeing my domain, the parameters in the URL, the value of the parameter in the URL but no no avail.

Can somebody offer some advice here please?

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