We have been trying to use the RestAPI without any luck and was hoping for some guidance. We already have several integrations using SOAP that work fine. When we try and connect we get an "Unauthorized error". We have tried using OAuth1 using the same configuration as our SOAP connections that work fine. We have also created a new integration using OAuth2.0 with the same Unauthorized error. When we look in the audit trail for any of the connections there are no references to the connections at all, failed or otherwise despite the error message telling us to look there. There are plenty of references to our SOAP connections. We have tried several different .NET code configurations, and tried using Postman with the same outcome. We have enabled all 3 of the SuitTalk WebServices along with Token-Based Authentication and OAUTH 2.0. We have been trying both with our Sandbox and our Live accounts with the same outcome. Any guidance on what we are missing would be greatly appreciated.

it looks like your header is trying to use parameters for the issue token endpoint