Microsoft 365 Authentication Review and Passkey Migration

Prepare for Microsoft's 2027 SMS and voice MFA retirement with an authentication review, passkey rollout, recovery testing and user migration from Altitude IT Support.

Key Dates

• 1 September 2026 — Microsoft begins prompting affected users to register passkeys
• 1 February 2027 — Microsoft-provided SMS and voice MFA retires completely

What This Service Includes

• Identify all users relying on SMS or voice MFA
• Design appropriate replacement authentication methods
• Pilot passkey rollout with a test group
• Test recovery routes and emergency access
• Manage the full user migration

From the Blog

Guest accounts in Microsoft 365 often slip through MFA policies that protect internal users. This article covers how guest authentication works, where the gaps appear and what a practical approach looks like.