General Error in API

Hello, I'm trying to get a Refresh Token via the zoho API.

I followed the documentation but all I get is a general error.

What I did:

1. Create Self Client in zoho Developer Console

2. Copy Client ID/Client Secret

3. Created a code with the needed scope (valid for 10 minutes)

4. Create the following request in Postman:

I also tried to use x-www-form-urlencoded with the same result.

If the code gets invalid after 10 Minutes, I get a "Invalid Code" error, so something is working here.

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