SharePoint Online Tenant Rename is now generally available without site count limits, enabling domain name changes for all tenants starting October 16, 2025. It supports business continuity, Microsoft 365 integrations, and requires SAM licenses for tenants with over 10,000 sites. Vanity domains and Multi-Geo are unsupported.
Applies to: SharePoint Online · Microsoft OneDrive
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).