Employees who use text messages or phone calls to confirm Microsoft account sign-ins may soon start seeing prompts to register a passkey.
Microsoft says that beginning September 1, 2026, passkeys will become the default authentication experience in Microsoft Entra ID. Users who are enabled for SMS or voice authentication may be automatically enabled and encouraged to register a passkey.
This does not mean every Microsoft 365 password will suddenly stop working on September 1. It does mean businesses should prepare employees for a different sign-in experience instead of waiting for an unfamiliar prompt to create confusion or support calls.
A passkey replaces a typed password with a secure credential stored on a trusted device or security key. The employee confirms the sign-in using something familiar, such as:
The important difference is that the passkey is tied to the real website or application where it was created. A fake sign-in page cannot simply collect it and reuse it in the way criminals reuse stolen passwords or verification codes.
Passkeys are therefore described as “phishing-resistant.” They are designed to keep working securely even when someone clicks a convincing imitation of a Microsoft sign-in page.
Text-message verification is better than using a password alone, but it is not the strongest form of protection. Criminals can trick employees into sharing codes, redirect mobile numbers, or use fake sign-in pages that capture passwords and verification codes together.
Microsoft says its own delivery of SMS and voice authentication for Entra ID is scheduled to retire on February 1, 2027. Organizations that still depend on these methods will need to move users to passkeys or another supported approach, or arrange a separate telecom provider where appropriate.
For a small business, the transition can offer two benefits:
However, those benefits depend on a careful rollout. An employee who loses a phone or replaces a laptop still needs a reliable and secure way to recover access.
Ask your IT provider to review which employees rely on SMS or phone calls for Microsoft sign-ins. Pay special attention to owners, managers, finance staff, administrators, and anyone with access to sensitive customer information.
A passkey saved on a phone may be convenient for most employees. Device-bound credentials, Windows Hello, or physical security keys may be more appropriate for administrators and employees with especially sensitive access.
There is no single answer for every business. Device ownership, remote work, regulatory obligations, and the types of information employees handle should influence the decision.
Start with a few employees who can report confusing prompts, compatibility problems, or recovery concerns. A pilot group gives the business time to improve instructions before expanding the change to everyone.
Determine how an employee will sign in if a phone is lost, a laptop fails, or a security key is misplaced. Recovery should involve identity verification and an approved IT process, not an informal request over email or text.
Consider registering more than one approved sign-in method where the platform and company policy allow it.
Employees should know that a passkey registration prompt may appear, but that does not make every unexpected sign-in request trustworthy. Staff should contact the approved IT support channel when uncertain instead of following instructions from an unsolicited caller or email.
A criminal who gains control of an account may try to register a new authentication method. Administrators should review authentication-method changes and remove access promptly when an employee leaves the company.
Passkeys can greatly reduce password phishing, but they do not protect a business from every threat. A stolen, unlocked device, unsafe account-recovery process, excessive user permissions, or malicious software can still create risk.
Businesses should continue to maintain software updates, managed device security, reliable backups, account monitoring, employee training, and a documented process for adding and removing users.
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