I see that the user resource supports "user" and "system" as values for the type property (which by the way should probably be included in the docs), but the email is still required and the result is the creation of a regular user, not a system account.
For clarity, the System User is actually a different resource in the system and uses different APIs.
The current
User
resource supports standard users but not system accounts.From this thread
For clarity, the System User is actually a different resource in the system and uses different APIs.