Getting an error as "Unable to authorize access because the client configuration is invalid: invalid

I have a free developer account with email harleen@iweb.co.uk and I am getting this error when trying to access code

I am using following URL as example-

https://secure.eu2.adobesign.com/public/oauth/v2?redirect_uri=https://google.com&
response_type=code&client_id=CBJCHBCAABAAnyFmg9sQLNtFLtNvcVkVrGi2arlEkKma&scope=agreement_sign:account