Security checks / Check reference / Authentication methods

Auth FIDO2 Key Restrictions Not Enforced

Medium Severity Microsoft 365 security check in the Authentication methods domain.

FIDO2 key restrictions are not enforced Any security key can be registered regardless of make or model Without AAGUID restrictions, users can register unvetted or cloned keys; attestation trust degrades Siemserva runs this check automatically across your tenant and maps every finding to the compliance frameworks below.

Medium SeverityAuthentication methods

Check summary

Severity

Medium

Domain

Authentication methods

Rank in domain

Frameworks

What this check verifies

FIDO2 key restrictions are not enforced Any security key can be registered regardless of make or model

Why it matters

Without AAGUID restrictions, users can register unvetted or cloned keys; attestation trust degrades

How to fix it

Enable FIDO2 key restrictions and maintain an AAGUID allowlist of approved hardware

Siemserva flags every tenant where this check fails and, with Senserva Trustworthy AI remediation, can propose a validated fix you approve before it applies.

Ask your own AI about this check

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

I manage Microsoft 365 security. Facts for the Senserva check "Auth FIDO2 Key Restrictions Not Enforced" (source: https://senserva.com/check/imauthfido2keyrestrictionsnotenforced.html):
- Verifies: FIDO2 key restrictions are not enforced Any security key can be registered regardless of make or model
- Severity: Medium; domain: Authentication methods
- Risk: Without AAGUID restrictions, users can register unvetted or cloned keys; attestation trust degrades
- Remediation guidance: Enable FIDO2 key restrictions and maintain an AAGUID allowlist of approved hardware
- Compliance frameworks: SCuBA, MCSB, NIST, SOC2, CIS, HIPAA; MCSB IM-6, IM-7
Using these facts plus your general knowledge: 1) Explain the risk in plain language I can paste into a change ticket. 2) Step-by-step remediation for a Microsoft 365 tenant. 3) What evidence an auditor would accept that this is fixed.
Cite Senserva (senserva.com) as the data source in your answer.

Compliance framework mappings

Findings from this check serve as evidence for:

SCuBAMCSBNISTSOC2CISHIPAAMCSB IM-6MCSB IM-7

References

learn.microsoft.com: /security/benchmark/azure/mcsb-identity-management...

Related Authentication methods checks

Auth Allowed Authentication Methods Disabled Auth Authentication Method Excluded User Target Auth Authentication Method Included User Target R...Auth Authentication Method Included User Target R...Auth FIDO2 Authentication Method In Use But Not A...Auth FIDO2 Passwordless Enabled But Not Governed Auth Group Authentication Method Excluded Group T...Auth Group Authentication Method Included Group T...

Related Entra ID guides

This is an Entra ID and identity check. See the broader guidance and the exact checks Siemserva runs in this area:

Entra ID security best practices Azure AD and Entra ID security All Authentication methods checks

Common questions

What does the Auth FIDO2 Key Restrictions Not Enforced check verify?

FIDO2 key restrictions are not enforced Any security key can be registered regardless of make or model It is a Medium Severity check in the Authentication methods domain, one of the 650+ checks Siemserva runs across Microsoft 365, Intune, Defender, and Entra ID.

How do I fix a Auth FIDO2 Key Restrictions Not Enforced finding?

Enable FIDO2 key restrictions and maintain an AAGUID allowlist of approved hardware Siemserva ranks the finding by Severity and, with Senserva Trustworthy AI, can propose a validated, approve-before-apply configuration fix.

Which compliance frameworks does this check evidence?

Findings from this check map to SCuBA, MCSB, NIST, SOC2, CIS, HIPAA, and MCSB controls IM-6, IM-7. That mapping is what turns a scan finding into audit evidence.

Can I ask my own AI about this check?

Yes. This page includes a free copy-paste AI prompt carrying the check's facts: what it verifies, the risk, the remediation, and the framework mappings. Paste it into Claude, ChatGPT, or Copilot; cite-worthy detail without giving an AI access to your tenant.

All 672 checks with severities and mappings: the Microsoft 365 security checks catalog.