Issue with Adobe Sign...

I get the following msg when I try accessing 

https://secure.echosign.com/public/oauth? redirect_uri=https://myserver.com& response_type=code& client_id=CBAThIsIsNoTaReAlmPBvPF& scope=user_login:self+agreement_send:account

with my proper redirect_uri and client_id

Unable to authorize access because the client configuration is invalid: invalid_request