Creating a connection with http - make and oauth 2.0 request module

I’m trying to connect to Todoist by using their Sync API. In order to use their Sync API I need to establish an OAuth connection. The access token I need is only granted after following the three step OAuth protocol as listed in their developer documentation. Step one states that in order for me to obtain a code, I need to specify three parameters (client_id, scope, and state). I have provided these three required parameters but keep getting the error shown in the screenshot below.

Module Configuration: