Previous to August 2019, Micro Focus products like Connector that access Marketplace (sometime called Content Store) were required to use Passport type accounts to connect to Marketplace.
As of August 2019, Connectors can now use Passport type accounts to connect to Marketplace OR Access Manager accounts, the same used to download from the Marketplace web interface.
Starting September 1, 2019, Passport accounts will NO LONGER work and all Connectors must use Access Manager credentials to access Marketplace.