Can’t use /wp-json/wp/v2/plugins API endpoint even as administrator

Using Basic Authentication as an Administrator, I am getting an error code 401 Unauthorized : [rest_cannot_view_plugins] Sorry, you are not allowed to manage plugins for this site. error when I attempt to access the GET /wp-json/wp/v2/plugins endpoint of my server. I can pull Post and Page info with no problem, but when I query against the plugins, I’m getting the 401 error. I’ve confirmed that the userid used in the API call should be able to manage plugins using the CLI tool:

#  wp user list-caps $  USER | grep plugin activate_plugins edit_plugins update_plugins delete_plugins install_plugins 

Any pointers would be appreciated.