DocuSign Authorization Code Grant flow returns invalid_grant error
<p>The <a href="https://docs.docusign.com/esign/guide/authentication/oa2_auth_code.html" rel="noreferrer">DocuSign documentation</a> goes through an easy to follow authorization flow for code grant. I'm able to get the "code" from the initial GET request to /oath/auth but getting the tokens gives me an error of "invalid_grant" when I try in postman. I've followed the steps and have a request that looks like this using account-d.docusign.com for host: </p>

<pre><code>POST /oauth/token
Content-Type: application/x-www-form-urlencoded
Authorization: Basic MjMwNTQ2YTctOWM1NS00MGFkLThmYmYtYWYyMDVkNTQ5NGFkOjMwODc1NTVlLTBhMWMtNGFhOC1iMzI2LTY4MmM3YmYyNzZlOQ==

grant_type=authorization_code&amp;code=ey2dj3nd.AAAA39djasd3.dkn4449d21d
</code></pre>

<p>Two other members of my team have also tried with their developer accounts and all are getting invalid_grant errors. Is this no longer supported or are there common errors associated with this error that we might be able to investigate? </p>