Microsoft is retiring SMS first-factor sign-in for Microsoft Entra ID workforce tenants worldwide and requires organizations to migrate affected users before February 1, 2027. The security-focused change will prevent employees from using a registered telephone number and SMS one-time passcode as their primary sign-in method, potentially disrupting Microsoft 365 and other Entra-protected services if administrators fail to prepare. SMS first-factor authentication, internally identified as SignInNoPassword, allows a user to enter a registered phone number instead of a username and password. Microsoft Entra ID then sends a six-digit SMS code that completes authentication. Although Microsoft initially intended it to simplify access...
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