Retirement of SharePoint One-Time Passcode (SPO OTP) and transition to Microsoft Entra B2B

Summary SharePoint One-Time Passcode (SPO OTP) authentication will retire by August 31, 2026, transitioning external sharing and authentication in OneDrive and SharePoint to Microsoft Entra B2B starting May 2026. External users must have Entra B2B guest accounts for access, enabling consistent governance and Conditional Access across Microsoft 365. Introduction We are retiring SharePoint One‑Time…