SharePoint Framework domain isolated web parts will be disabled for new tenants starting April 2, 2025, and fully retired for all tenants by April 2, 2026. After this, these web parts will stop working and show errors. Organizations should update and redeploy affected web parts as regular ones before the deadline.
Applies to: SharePoint Online
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).