Could you provide me the context in which you are referring to?
Generally all cloud customers have a URL structured <companyname>.jiveon.com.
I eventually realized that I needed to sign up at jiveon.com, and not the community developer site, in order to have an <companyname>.
I know it's stupid, but should probably be made clearer in the docs. A sentence at the top such as "In order to use the Jive Api you will need to have a registed account at jivone.com", with a link to the site.