MC1243549 — Retirement of SharePoint One-Time Passcode (SPO OTP) and transition to Microsoft Entra B2B

SharePoint One-Time Passcode (SPO OTP) authentication retires in October 2026, transitioning external sharing and authentication to Microsoft Entra B2B. New external sharing uses Entra B2B from May 2026. External users need guest accounts for access; admins should prepare by updating policies and managing guest accounts accordingly.

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