SharePoint Online Tenant Rename is now generally available for tenants with up to 500K sites, allowing domain name changes during rebranding or mergers. It ensures high reliability, business continuity, and compatibility with Microsoft 365 apps, but excludes vanity domains, Multi-Geo, and tenants over 500K sites.
Applies to: SharePoint Online · Microsoft OneDrive
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).