Passkeys are showing up in Microsoft, Google, and Apple accounts now, with broader business adoption accelerating in 2026. If you have encountered a 'Sign in with a passkey' prompt and wondered what is actually happening, this post explains it in plain language and outlines what it means for your BC business's authentication strategy.
What a Passkey Actually Is
A passkey is a cryptographic credential stored on your device that replaces a password. When you authenticate, your device proves your identity using public-key cryptography without sending a password to the server. The server stores only a public key, so there is nothing useful to steal in a data breach.
Passkeys are tied to a specific site or application - a passkey for Microsoft cannot be replayed on a fake Microsoft site. This makes them inherently phishing-resistant, which is the property that makes them significantly more secure than passwords combined with SMS OTP.
How They Are Different from Passwords Plus MFA
Passwords plus MFA is still vulnerable to real-time phishing attacks where a threat actor proxies the authentication session. Passkeys are not, because the cryptographic verification is bound to the legitimate domain. A passkey will not authenticate to a convincing fake login page.
Passkeys also eliminate password reuse, weak password choices, and credential stuffing as attack vectors. There is no password to reuse or guess. The security improvement is material.
Business Deployment Reality in 2026
Microsoft Entra ID (formerly Azure AD) supports passkeys via FIDO2 keys and the Microsoft Authenticator app. Passkey support for business accounts is maturing but is not yet seamless for all users and all devices. Plan for a mixed environment through at least 2027.
Google Workspace has broader passkey support at the consumer level. Business deployment for Workspace is in progress. Check your vendor's roadmap before committing to a passkey-first authentication strategy.
What This Means for Your Current Setup
If you are running MFA via Microsoft Authenticator or FIDO2 hardware keys today, you are already positioned well for the passkey transition. The underlying technology is closely related. The user experience change is the main adaptation.
If you are still on password-only or SMS OTP authentication, prioritise getting to MFA first. Passkeys are the next step in the journey, but MFA is the more urgent upgrade for most BC SMBs in 2026.
When to Start the Transition
Begin evaluating passkeys for privileged accounts now. Admin accounts are the highest-value targets and benefit most from phishing-resistant authentication. Microsoft Authenticator passkey support is production-ready for M365 admin roles.
For general user accounts, wait for your identity platform to declare passkeys generally available and fully supported. Implement for early adopters on a voluntary basis, document the experience, and plan a broader rollout for 2026 to 2027.