ClientID has no @ symbol

Hi, I am a new user of Zitadel and am receiving a 400 error (ERROR:auth:Introspection request failed: 400 Client Error: Bad Request for url:) when using the private JWT key auth method. I believe I am passing the token appropriately but I have a sneaking suspicion the fact that my clientID is different than the documentation may be an issue. My clientID does not include the @project_name. As I was reading through the documentation it seems as when you select the private key JWT authentication method it defaults to the APP.APIMETHOD rather than the private key JWT.