Usually the 500 error occurs because the request body is malformed. Can you please open a case with us by sending us an email to developers@okta.com in order to check also the back-end logs and confirm the cause of this issue?
@Robinyo that does not work, /v1/token does not work /token does. introspect does not work, neither anything else mentioned in the document.
I can successfully call the token api with any of the grant types, all the other APIs send me a 500 error. And yes I am sending the correct Method, POST.
@dragos the body is exactly as it is stated in the docs. So for retrospect I send
token, token_type_hint, client_id, client_secret.