OAuth failure - returns wrong grant_type

[gingerdudley]

Hello, I am currently trying to incorporate the Spotify iOS API into my Swift application. I have followed along with the login demo and am now trying to replace the localhost:1234 fields with my own token url.
The call back from Spotify to my app is resulting in an error with the message "invalid_grant" and "Authorization Failed"
I have attached an image of my code to set up the configuration var. Is there anything I am missing in the set up or doing wrong that you guys can help me find? We have been working for a while and still want to use your API if we can set it up. Thanks!