A tenancy is a workspace that allows organisations to manage their Whooshkaa data. This includes things like shows, playlists, media assets and other items that would be managed from within the Whooshkaa dashboard. Each show "belongs" to a tenancy and access to manage it is done through access control via a group.
Each podcaster user and podcast organisation that uses Whooshkaa has their own tenancy.
To get access to a specific tenancy or to a particular show, you need to be part of a group that has access to it.