Unable to use own API key(s) for domains which are delegated to my account



A client has delegated administration of their domains to my account and via GUI I can do almost anything. But via API I can not do anything for the client. If I try to create any domains via API they will be tied to my personal account. So far the only working way is to get login name and API keys from the owner of the domain.

Is this part by mistake, by intention or simply not developed yet?

Thank you.