Returns all teamsites defined in the tenant, including teamsites the current user may not have direct content access to.

Use this endpoint to discover valid teamsite identifiers before calling teamsite-scoped APIs such as Library Content Management endpoints.

Glossary: teamsite — Tenant-scoped workspace partition used to organize Library content, permissions, and configuration context. default teamsite — Primary tenant teamsite represented by identifier 1, commonly used when integrations do not target a specific custom teamsite.