Hey folks, I was evaluating Zitadel for my SAAS solution. I needed some help regarding the API application under my project. I was following the steps in this link from the documentation: https://zitadel.com/docs/guides/integrate/token-introspection/private-key-jwt I created an API application under my project and selected "Private Key JWT" for authorisation. I generated the JWT based on the key, keyId and clientId that I found in a JSON file, which was downloaded when I created a key under that API application. I hit this URL "https://********.zitadel.cloud/oauth/v2/introspect" from "https://hoppscotch.io/" I am getting 500 every time, with this message body: { "error": "invalid_client", "error_description": "client must be authenticated" } I am confused about how I can solve this problem. I intend to use the Zitadel API to get some data, like roles and some other info, to my web API backend.