Cannot comunicate with Google Adwords API, getting "invalid_grant" error...

I used my MCC account to generate my WEB Application. So now i have access to the client_id and the client_secret: client_id = "450382064948.apps.googleusercontent.com" client_secret = "x" I'm using the PHP client library and the GetRefreshToken.php dont give me a refresh to

Cannot access adwords API. Getting "error" : "invalid_grant".

I used my MCC account to generate my WEB Application. So now i have access to the client_id and the client_secret: client_id = "450382064948.apps.googleusercontent.com" client_secret = "x" I'm using the PHP client library and the GetRefreshToken.php dont give me a refresh to