Paypal REST Oauth提供重定向错误

Paypal is giving me this error

Relying Party Validation error: redirect_uri provided in the request does not match with the registered redirect_uri. Please check the request.

When trying to get an oAuth login box to show up. I have copy and pasted the redirect_uri from paypal into my code.

This is the URL i'm directing the user to

https://www.paypal.com/webapps/auth/protocol/openidconnect/v1/authorize?client_id=<MYCLIENTID>&response_type=code&scope=email&redirect_uri=<MYREDIRECTURL>

Note that is copy and pasted from App return URL (live) on https://developer.paypal.com/webapps/developer/applications/editapp

Any idea how to get past this error?

Yes, I contacted paypal and they had to "enable some setting" on their end. And they said yes it was only something they could do on their end.