kong oauth2 route with GET method

Interesting, makes sense because Proxy is locked down to GET only but OFC if you enable oauth2 on it you would hope logic could over-ride that default to allow POST get the token specifically on that /oauth2/token path (but it does not apparently in your testing).

In the mean time here is a working alternative, setup a separate global token URL and enable global on the oauth2 token generation like I described here: