Identity: Multitenancy and Groups, for e.g. mapping users and common roles to unique companies

[winecraft]

Hello, please help with a feature or some guidance - how is a public SaaS web app, beyond an intranet to handle multi-tenancy with just roles and users, when the same roles can exist across various groups such as companies registering?

In a web app, there are many common Roles for e.g. employees, managers etc. across companies...

While you let us extend the users and roles, there is no-convenient way or no-mapping of these common roles(mgrs) to unique companies(groups) and their users. For e.g. Walmarts-Managers vs HomeDepot-Managers, how do the developers map this for a Saas web app, outside a company/intranet scenario?

For instance, starting at one level above, how can I say
Group("Targett").GetRole("Managers").ToList(); or
Group("CNNN").GetRole("Editors").ToList();

[rustd]

Identity is not meant for multi-tenant scenarios.