Microsoft Entra ID will retire custom CSS layout and positioning properties in company branding by late October 2026 to enhance security and reduce phishing risks. Organizations using these properties must update branding configurations before then; new use will be blocked from July 21, 2026. Branding will revert to default layouts after retirement.
Applies to: Microsoft Entra
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).