Thanks, I tried building a URL like this which makes a redirect to the given redirect uri with the parameter “error=invalid_request error_description=Missing+parameter%3A+code_challenge_method”. Isnt this a code when using OAuth or something?
As you don’t tell us anything about the client and its configuration you are using, I assume you use a (public?) client with enabled PKCE option. This yields in missing code challenge method. Try to add a code_challenge_method query parameter with the proper value you have configured in your client.