Getting authorization for Zoho APIs - oauth

Question

I am trying to follow Zoho's guide for getting authorized via OAuth. Unfortunately, the guide seems a little outdated as the API Console doesnt look like the screen shots provided in the guide.
This is what I am trying to accomplish
I'm developing a windows client application. So naturally i chose the Non-Browser Application for my zoho client (in the API Console). Using this client type there is no "Authorized Redirect URIs".
So how am i supposed to get authorized to start using the Zoho APIs?
Currently, i've tried various client types w/ various redirect uris (bogus). I am getting an http code response of 500.
I am basically calling an HttpClient GetAsync(requestUrl ) where requestUrl is defined below:
var scopeValue = $"{scope}&client_id={clientId}&client_secret={secret}&response_type=code&access_type=offline";
var requestUrl = $"https://accounts.zoho.com/oauth/v2/auth?scope={scopeValue}";
Question
Why am i getting a 500 error when i invoke this GET request to get authorized?
Am I choosing/configuring the wrong zoho client type?
Is there a difference between a Zoho Account Id and User Id (this MIGHT be one of my problems)?
Just for FYI, here is the Zoho API Console with the various client types to choose from:

Answer 1

Try going to a different requestUrl. I believe you should be going here. You should also be using a POST request. I chose the Non-Browser Application for my zoho client (in the API Console). And I am able to get a response.
https://accounts.zoho.com/oauth/v3/device/code?client_id=xxxx&scope=ZohoProjects.tasklists.READ&grant_type=device_request
I wrote this in VBA only for trouble shooting this question.
Set objHTTP = CreateObject("MSXML2.ServerXMLHTTP")
Url = "https://accounts.zoho.com/oauth/v3/device/code?" & _
"client_id=xxx&" & _
"scope=ZohoProjects.tasklists.READ&" & _
"grant_type=device_request"
objHTTP.Open "POST", Url, False
objHTTP.setRequestHeader "Content-Type", "application/x-www-form-urlencoded"
objHTTP.Send ("")
replyTXT = objHTTP.responseText
Debug.Print (replyTXT)
I believe this link has some helpful information.
https://www.zoho.com/accounts/protocol/oauth/devices/initiation-request.html