Shiny Proxy with B2C

Im having trouble setting up

Shiny Proxy with B2C

here is the error i get am i missing something ? Can someone from the community provide some assistance?

Thanks

2022-11-14 00:14:11.600 ERROR 1 — [XNIO-1 task-1] e.o.c.a.i.OpenIDAuthenticationBackend : org.springframework.security.oauth2.core.OAuth2AuthenticationException: [invalid_token_response] An error occurred while attempting to retrieve the OAuth 2.0 Access Token Response: 401 Unauthorized: [no body]

can someone shed some light why iam getting this error .