The documentation portal is undergoing maintenance. During this period, you can't create any new user credentials. If you do, you'll need to recreate the user credential after the maintenance period ends.
A system-defined role is a role that you cannot edit or delete. The Administrator role is a system-defined role.
When you assign the Administrator role to a user or group for the domain or
Edge Data Streaming
Service, the user or group is granted all privileges for the service. The Administrator role bypasses permission checking. Users with the Administrator role can access all objects managed by the service.