Authservice OIDC Failing With RetrieveToken Error

Security
1

Configured Authservice with the new CUSTOM AuthorizationPolicy. MeshConfig extensionProviders is using grpc - all is functioning correctly and almost perfect … however, I see the following ONLY error in the Authservice log:

[2022-01-07 18:04:13.210] [console] [trace] RetrieveToken
[2022-01-07 18:04:13.210] [console] [info] RetrieveToken: form data is invalid

Line 595 of this page indicate this maybe related to " // Extract expected state and authorization code from request" … I got below (redacted)

https://xxxxxxx.okta.com/oauth2/default/v1/authorize?
client_id=xxxx0oabadFBKHS297
&nonce=ndddddLt21CA5AOBtSeGmEEIlF6QDwNqTppENc
&redirect_uri=https%3A%2F%2Farizona.ddd.deddddyn.io
&response_type=code
&scope=openid
&state=xxxxxwLDAmgVLddddsssumcyRUg-dN8kiXT9k5x-pCYw

authservice/oidc_filter.cc at 60dadd6181bfcac88374d5f944954b35e69d9921 · istio-ecosystem/authservice · GitHub (line 595).

Below is a successful return using another redirect_Uri: Example OAuth Client

POST https:/xxxxxx/ss.okta.com/oauth2/default/v1/token
grant_type=authorization_code
&code_verifier=xxxxxxxxa872a81274712383c7fe1e667e90f5aec7b2f4e3622f3dd1ef648e14eb1273ec573f7090b637a661
&redirect_uri=https%3A%2F%2Fexample-app.com%2Fclient
&client_id=xxxwwwwwwa12mDUFBKHS297
&client_secret=xxxxxcccjHupCBFVqHdflJaD2Jsa

I will truly appreciate any help to get over this hump. I’m using AKS and Okta as IdP.
Thank you