Missing Parameter : Code_Challenge_Method

[Narendra Kumar Challa]

Hi Experts,

I created my first client on KeyCloak and when I am trying to access the below URL , Please note that Proof Key for Code Exchange Code Challenge Method is configured to be plain

http://localhost:8080/auth/realms/MyFirstRealm/protocol/openid-connect/auth?response_type=code&client_id=MyFirstClient&redirect_uri=http://localhost:8080/app&scope=openid

is redirecting to the app (Below URL) with the error message in the query string, 

http://localhost:8080/app?error=invalid_request&error_description=Missing+parameter%3A+code_challenge_method 

Please advise.

Thanks,
Narendra