You must be an API user in Address Manager to log on to the system and access the Address Manager Legacy v1 API.
Address Manager API users have a specific access type and cannot log in to Address
Manager through the GUI (graphical user interface) unless access rights for the GUI are
also granted. Similarly, GUI users cannot connect to Address Manager through the API
interface unless granted additional API access rights.
Tip: For more
information about API access and setting up Role-based Access Control (RBAC), refer
to Users, groups, and access rights in the Address Manager
Administration Guide.
To create an Address Manager user with API access: