OneDrive mobile apps will no longer support SharePoint Server on‑premises sign-ins

🚨 The Signal: OneDrive mobile apps will block sign-ins from SharePoint Server on-premises accounts starting June 2026. This mandates modern authentication for mobile file access, enhancing security posture and aligning with modern identity standards.

The Impact

Organizations with on-premises SharePoint users accessing OneDrive mobile apps face a security risk if they do not migrate to modern authentication.

• On-premises SharePoint users: Will lose mobile OneDrive access without migration.
• Security teams: Must ensure modern authentication is adopted for mobile access.
• IT administrators: Need to plan and execute migration of affected users.
• Organisations: Risk non-compliance and reduced security posture if not addressed.

The Action

1. Identify users currently signing into OneDrive mobile apps with SharePoint Server on-premises accounts.
2. Plan migration of identified users to Microsoft 365 or Microsoft Entra ID accounts.
3. Implement modern authentication policies, including Conditional Access, for mobile access.
4. Communicate the change and new sign-in requirements to affected users.
5. Verify successful migration and modern authentication enforcement post-change.

Domain: Entra · Impact: high · Workload: OneDrive · Essential Eight: Multi-Factor Authentication · ISM: ISM-0109, ISM-0123, ISM-0140, ISM-0974, ISM-1173, ISM-1228, ISM-1401, ISM-1504, ISM-1505, ISM-1679, ISM-1680, ISM-1681, ISM-1682, ISM-1683, ISM-1815, ISM-1819, ISM-1872, ISM-1873, ISM-1874, ISM-1892, ISM-1893, ISM-1894, ISM-1906, ISM-1907