Microsoft 365 has become the backbone of modern business productivity, which also makes it a prime target for credential theft and phishing attacks. Passkeys are the latest weapon against ever-more sophisticated ways around other forms of authentication security.
Microsoft 365 has become the backbone of modern business productivity, which also makes it a prime target for credential theft and phishing attacks. While traditional multi‑factor authentication (MFA) such as SMS codes, one‑time passwords and push notifications were once effective, attackers can now intercept or socially engineer these methods with ease.
Passkeys are Microsoft’s new, phishing‑resistant authentication method designed specifically to stop these attacks. They replace passwords and MFA codes with secure cryptographic keys stored on your device, delivering both stronger protection and a seamless sign‑in experience.
What are passkeys in Microsoft 365?
Passkeys in Microsoft 365 are FIDO2‑based credentials created and stored on your device (iPhone, Android, Windows, or Mac). Unlike passwords, a passkey is never typed, shared or transmitted, meaning it cannot be phished or intercepted.
When you sign in, your device proves to Microsoft 365 that it holds the private key linked to your account. This proof only works on genuine Microsoft login pages, making phishing attacks ineffective.
Why passkeys are more secure than traditional MFA
- No SMS or app codes that can be intercepted.
- No push‑notification fatigue attacks.
- Private keys never leave the device.
- Authentication only completes on trusted Microsoft domains.
- Requires biometric or PIN verification.
Even if a user clicks a fake link, the attacker cannot steal or replay a passkey.
Benefits for your business
- Strong defence against phishing, MFA fatigue and session hijacking.
- Faster sign‑in using Face ID, Touch ID, fingerprint or device PIN.
- No passwords to forget, reset or reuse.
- Aligns with Microsoft’s Best Practice and Cyber Essentials.
How Priority IT can implement this for you
Priority IT can fully manage the rollout of phishing‑resistant MFA and passkeys across your organisation:
- Configure Microsoft Entra ID for Passkey authentication.
- Deploy Conditional Access policies to require phishing‑resistant login outside trusted locations.
- Onboard staff with clear, step‑by‑step passkey setup guides.
- Migrate existing MFA users to passkeys with minimal disruption.
- Provide hardware FIDO2 keys for administrators and high‑risk users.
- Enforce Zero‑Password policies to simplify and secure authentication.
- Monitor and support your environment to ensure successful adoption.
Our team handles configuration, testing and user training, ensuring your organisation moves to Microsoft’s most secure identity standard without complexity or downtime.
Why you should implement passkeys now
Phishing‑resistant MFA is rapidly becoming the security baseline for UK organisations. With attackers increasingly using real‑time phishing tools and automated credential theft, passkeys close the final gap in account protection.
For organisations using Microsoft 365, passkeys provide the strongest, simplest and most future‑proof way to secure user access.
