When GOV.UK One Login reported that more than 300,000 users adopted passkeys during their trial, with nearly 10% of daily sign-ins now using biometric authentication, enterprise security teams were skeptical: "That's great for consumers, but it won't work here."
These objections echo those that delayed multi-factor authentication adoption for years. But as the UK government shows cost savings of nearly £600 per day in SMS expenses alone, it's worth examining which concerns about passkey deployment are legitimate technical constraints and which are outdated myths.
Myth 1: Users Will Reject Passkeys Because They're Too Technical
Reality: Users adopt passkeys faster than traditional methods when given the choice.
The GOV.UK trial saw 300,000 users voluntarily switch to passkeys. These users aren't tech experts; they're citizens accessing government services, filing taxes, and applying for benefits. The platform serves over 23 million users with varying technical skills.
The real friction isn't using passkeys, it's in your rollout communication. If you present passkeys as a complex security upgrade, adoption will lag. Frame it as "sign in with your face or fingerprint instead of remembering another password," and users will migrate quickly.
Offer passkeys as an option during the next successful authentication, not as a mandatory switch. Let users choose when they're ready, and you'll see organic adoption without overwhelming your help desk.
Myth 2: Passkey Implementation Requires Replacing Your Entire Authentication Stack
Reality: Passkeys integrate with existing FIDO2 infrastructure through standard protocols.
You don't need to replace your identity provider. Major platforms like Azure AD, Okta, Ping Identity, and Auth0 support passkey registration and authentication flows. If your IdP supports WebAuthn, you can start enrolling passkeys today.
The integration is straightforward. Your application redirects to the identity provider for authentication. The IdP presents passkey as an option alongside existing methods. The user authenticates with their device biometric or PIN. Your application receives a standard OAuth 2.0 token. Your application's authorization logic remains unchanged.
The real work is in deciding your enrollment strategy, defining which user groups get passkey options first, and updating your incident response procedures for device loss scenarios.
Myth 3: Passkeys Create Vendor Lock-In Through Proprietary Formats
Reality: FIDO2 credentials are portable across platforms through standardized protocols.
This myth persists because early platform authenticators (Touch ID, Windows Hello) stored credentials in device-specific secure enclaves. However, the FIDO Alliance designed the standard to prevent lock-in. Your passkey isn't tied to a single vendor's ecosystem.
Modern passkey implementations support sync through encrypted cloud keystores. A user who registers a passkey on their iPhone can authenticate from their MacBook or iPad without re-enrollment. Google and Microsoft offer similar sync capabilities.
For enterprise deployments, you control the relying party identifier. If you migrate identity providers, users don't need to re-register their passkeys. The cryptographic relationship is between the user's authenticator and your domain, not your vendor's infrastructure.
The portability concern worth addressing is cross-platform sync. A user with passkeys in Apple's keychain can't automatically use them on an Android device. This isn't lock-in; it's a limitation of current sync implementations. Plan for users who switch ecosystems by maintaining fallback authentication methods during your transition.
Myth 4: Biometric Authentication Creates Privacy Risks We Can't Mitigate
Reality: Passkey authentication never transmits biometric data to your servers or identity provider.
The biometric scan happens entirely on the user's device. When a user authenticates with Face ID or fingerprint, that biometric template never leaves the device's secure enclave. What your server receives is a cryptographic signature proving the private key holder completed the authentication challenge.
This architecture means you have zero biometric data to protect or comply with biometric privacy regulations. Your liability surface actually shrinks compared to password authentication, where you're responsible for securely hashing and storing password material.
The privacy concern that deserves attention is device attestation. FIDO2 supports optional attestation, where the authenticator can prove it's a genuine hardware device from a specific manufacturer. If you require attestation, you're collecting data about user devices. Most deployments should use self-attestation (no device identity) for consumer scenarios and reserve full attestation for high-security contexts like privileged access.
Myth 5: The ROI Doesn't Justify the Migration Effort
Reality: Passkey deployment reduces measurable costs in SMS delivery, password reset workflows, and phishing incident response.
GOV.UK reports £600 per day in SMS savings. For a platform with 23 million users, that translates to roughly £219,000 annually from eliminating one-time password delivery alone. Your calculation will differ based on your SMS volume and provider rates, but the cost structure is clear: every passkey authentication eliminates an SMS delivery charge.
The larger savings come from password reset reduction. Industry benchmarks estimate $70 per password reset incident when you include help desk time and user productivity loss. If 5% of your user base resets passwords quarterly, you're looking at substantial help desk burden. Passkeys eliminate password resets entirely for enrolled users.
The hardest cost to quantify is phishing resistance. Passkeys are cryptographically bound to your domain. A user physically cannot authenticate to a phishing site using a passkey, even if they want to. When you calculate the cost of credential phishing incidents, including investigation time, forced password resets, and potential account compromise, the ROI case strengthens considerably.
What to Do Instead
Stop treating passkey adoption as an all-or-nothing migration. Deploy them as an optional enhancement alongside your existing authentication methods.
Start with your internal workforce before rolling out to customers. Your employees are more tolerant of early deployment friction and can provide feedback before you expose customers to issues.
Identify your highest-value accounts first. Privileged users, finance teams, and anyone with access to sensitive systems should be your initial enrollment targets. These users already tolerate authentication friction for security; passkeys reduce that friction while improving security posture.
Measure your baseline costs now: SMS delivery charges, password reset ticket volume, and authentication-related help desk time. You need these numbers to demonstrate ROI six months into your deployment.
The UK government didn't achieve nearly 10% passkey adoption by waiting for perfect conditions. They offered users a faster, simpler authentication option and let the value proposition drive adoption. Your deployment can follow the same pattern.
