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

SharePoint One-Time Passcode (SPO OTP) authentication will retire starting July 2026, transitioning external sharing and authentication in OneDrive and SharePoint to Microsoft Entra B2B. New external sharing invitations begin using Entra B2B in May 2026. External users without guest accounts will lose access unless a guest account is created or content is re-shared. No admin action is required, but organizations should inform users and review sharing policies. The change affects all Microsoft 36...