The Reality of Passkey Migration - Compatibility Barriers for Organizations and Individuals

About 11 min read

Passkeys (FIDO2/WebAuthn), the authentication method poised to replace passwords, are rapidly gaining adoption as a technology that combines phishing resistance with usability. According to a 2024 FIDO Alliance survey, services supporting passkeys increased by over 50% year-over-year, and all three major platforms - Google, Apple, and Microsoft - now support passkey synchronization. However, real-world migration is plagued by compatibility issues: services that should work but do not, and authentication failures after switching devices. This article provides a technical analysis of the reality of passkey migration as of 2025, examines the challenges facing both organizations and individuals, and presents a realistic phased migration roadmap. During the transition period, it is critical to use strong passwords generated on Passtsuku.com alongside passkeys to avoid any authentication gaps.

Conclusion - Passkey Migration Is Not All-or-Nothing

Attempting a complete passkey migration all at once frequently stalls against compatibility barriers. The realistic approach is to establish a hybrid period using both passkeys and passwords, migrating gradually starting with supported services. For services that do not yet support passkeys, combine random passwords of 20 characters or more generated on Passtsuku.com with two-factor authentication. A fully passwordless environment is expected to take until around 2027, when industry-wide standardization progresses further.

How Passkeys Work Technically

FIDO2/WebAuthn Authentication Flow

Passkeys are a public-key cryptography authentication technology based on the FIDO2 standard. While traditional password authentication stores secret information (password hashes) on the server, passkeys store only the public key on the server, with the private key securely held within the user's device. During authentication, the server sends a challenge (random data), and the device signs it with the private key and returns it. The server verifies the signature with the public key, so no secret information ever traverses the network. This mechanism fundamentally eliminates the risk of entering credentials on phishing sites. The WebAuthn API is implemented in browsers and cryptographically verifies the origin (domain) of authentication requests, so authentication cannot succeed on fake sites impersonating legitimate ones.

Cross-Platform Passkey Synchronization

Since 2024, Apple (iCloud Keychain), Google (Google Password Manager), and Microsoft (Windows Hello) have each implemented passkey synchronization within their own ecosystems. Passkeys sync automatically between Apple devices via iCloud Keychain and between Android devices via Google Password Manager. However, this is where the biggest challenge lies. As of April 2025, there is still no standardized method to transfer a passkey created on Apple to Android, or vice versa. FIDO Alliance published draft specifications for the Credential Exchange Protocol (CXP) and Credential Exchange Format (CXF) for cross-platform transfer in 2024, but implementation on major platforms is not expected until the second half of 2025 or later.

To gain a deeper understanding of how passkeys work technically, FIDO2 authentication technical guides (Amazon)can also be helpful.

Major Service Support Status as of 2025

Passkey adoption is advancing rapidly, but implementation levels vary significantly across services. Google, Apple, and Microsoft accounts can use passkeys as primary authentication and fully support passwordless login. Amazon, PayPal, GitHub, and Shopify have also added support, though some position passkeys as one method of two-factor authentication rather than eliminating passwords entirely. In Japan, Yahoo! JAPAN began passkey support in 2023, and NTT DOCOMO's d Account followed in 2024. However, many domestic banks and government services remain without passkey support. According to Passkeys.directory, approximately 400 services worldwide supported passkeys as of March 2025, but the majority of services used daily still require password authentication.

Migration Challenges Facing Organizations

Legacy System Integration

The biggest barrier for enterprise passkey migration is integration with legacy systems. Many enterprise applications still rely on LDAP or Active Directory-based password authentication, and adding FIDO2 support requires modifications to the authentication layer. Particularly in industries like finance and healthcare, core systems running on mainframes or older middleware often cannot be updated to support WebAuthn. According to a 2024 Gartner survey, only 15% of enterprises with over 1,000 employees had completed passkey deployment for internal systems, with 60% citing legacy system integration as the primary obstacle. A realistic approach is to introduce an SSO identity provider (IdP) that supports FIDO2 and use it as a bridge to legacy systems, rather than modifying each system individually.

User Education and Support Costs

While the concept of passkeys is intuitive for technical users, the experience of logging in without entering a password can create anxiety for general users. A 2024 Hypr survey found that 42% of companies that deployed passkeys reported a temporary increase in user inquiries. The most common inquiries include being asked for a password despite having set up a passkey (service-side fallback behavior), passkeys not working on new devices (sync delays or lack of support), and not knowing how to recover after accidentally deleting a passkey. Organizations need to prepare help desk response manuals before migration and use phased rollouts to distribute the concentration of inquiries.

Challenges Facing Individual Users

Device Loss Recovery Issues

The biggest risk with passkeys is recovery when the device holding the private key is lost. With passwords, "forgot password" reset flows are well established, but with passkeys, the device itself is the authentication key, making recovery significantly more difficult. If you use cloud sync via iCloud Keychain or Google Password Manager, passkeys are restored simply by signing in on a new device. However, if cloud sync is disabled or when migrating across platforms (such as switching from iPhone to Android), all passkeys must be re-registered. A FIDO Alliance survey found that 23% of passkey users "do not know the recovery procedure for device loss," and this awareness gap is a barrier to adoption.

Account Sharing with Family and Teams

While passwords could be shared among family members (though not recommended), passkeys are inherently difficult to share because they are tied to biometric authentication or device PINs. In reality, account sharing needs exist for family accounts on streaming services and shared accounts for small businesses. Apple introduced passkey sharing via AirDrop in 2024, but this is limited to Apple devices. Third-party password managers like 1Password and Dashlane have begun supporting passkey storage and sharing, but this does not work if the service does not allow third-party passkey storage. This issue represents a fundamental contradiction between passkey design philosophy (authentication tied to individuals) and real-world use cases (shared accounts), and short-term resolution is difficult.

Phased Migration Roadmap

Phase 1: Register Passkeys for Key Accounts (Now)

Start by registering passkeys for services that fully support them, such as Google, Apple, and Microsoft accounts. These services allow concurrent use of passkeys and passwords, so adding a passkey will not disable your existing login method. Even after registering passkeys, maintain strong passwords generated on Passtsuku.com as backup authentication. They serve as a fallback if passkeys cannot be used for any reason.

Phase 2: Password Manager Integration (1-3 Months)

Adopt a password manager that supports passkey storage (1Password, Dashlane, Bitwarden, etc.) and centrally manage both passkeys and passwords. This resolves the cross-platform issue, as third-party password managers work across Apple, Android, and Windows. Migrate all existing passwords to the password manager and generate unique passwords of 16 characters or more for each service on Passtsuku.com.

Phase 3: Gradual Transition to Passwordless (6-12 Months)

As more services support passkeys, gradually transition to passwordless starting with services where passwords can be disabled. However, eliminating passwords across all services is not realistic as of 2025. For services that do not support passkeys, continue using strong passwords generated on Passtsuku.com combined with two-factor authentication. After 2026, when CXP/CXF specification implementation progresses and cross-platform migration becomes easier, a full transition to a passwordless environment will become more realistic.

What You Can Do Right Now

1. Register a passkey in your Google account security settings (Settings → Security → Passkeys and security keys)
2. Update passwords for services without passkey support to 16 characters or more on Passtsuku.com
3. Check passkey support status for your services on Passkeys.directory
4. Verify your passkey recovery methods (enable cloud sync, backup authentication methods)
5. Enable two-factor authentication on all accounts, preferring authenticator apps over SMS

Frequently Asked Questions

Do I no longer need a password after setting up a passkey?

Most services retain your password even after setting up a passkey. Passkeys function as the preferred login method, but it is recommended to maintain a password as backup in case of device loss or passkey issues. Setting a strong password of 16 characters or more on Passtsuku.com ensures you can log in safely even when passkeys are unavailable.

What happens to my passkeys when switching from iPhone to Android?

As of April 2025, there is no standard method to directly transfer passkeys stored in iCloud Keychain to Android. You need to re-register passkeys on the new Android device for each service. Using a third-party password manager like 1Password allows cross-platform passkey management, but requires service-side support. Once FIDO Alliance's CXP/CXF specifications are implemented, this issue is expected to be resolved.

We are considering passkey deployment for our organization. Where should we start?

First, check whether your SSO identity provider (IdP) supports FIDO2. If the IdP supports passkeys, you can introduce passkey authentication without modifying individual applications. Next, conduct a pilot with a small group in the IT department to understand help desk inquiry patterns before company-wide deployment. During the transition period, it is important to maintain strong passwords and two-factor authentication on all accounts.