Security checks / Check reference / Conditional Access
Conditional Access Enforces Block Unknown Device
Info Severity Microsoft 365 security check in the Conditional Access domain.
A CA policy blocks sign-ins from unknown/unsupported device platforms across all apps Unknown/unsupported device platforms are blocked by this policy, reducing access from unmanaged endpoints Siemserva runs this check automatically across your tenant and maps every finding to the compliance frameworks below.
Check summary
What this check verifies
A CA policy blocks sign-ins from unknown/unsupported device platforms across all apps
Why it matters
Unknown/unsupported device platforms are blocked by this policy, reducing access from unmanaged endpoints
How to fix it
Maintain unknown device blocking; review exceptions and confirm bypass attempts are logged
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.
Compliance framework mappings
Findings from this check serve as evidence for:
References
Related Conditional Access checks
Common questions
What does the Conditional Access Enforces Block Unknown Device check verify?
A CA policy blocks sign-ins from unknown/unsupported device platforms across all apps It is a Info Severity check in the Conditional Access domain, one of the 650+ checks Siemserva runs across Microsoft 365, Intune, Defender, and Entra ID.
How do I fix a Conditional Access Enforces Block Unknown Device finding?
Maintain unknown device blocking; review exceptions and confirm bypass attempts are logged 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, including SCuBA policy MS.AAD.1.1v1, MS.AAD.2.1v1, MS.AAD.2.2v1, MS.AAD.2.3v1, MS.AAD.3.1v1, MS.AAD.3.2v1, and MCSB controls IM-6, ES-1. 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.