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Conditional Access in Azure is a security tool that acts as a gatekeeper for your cloud resources. It works by creating policies that check specific signals before allowing access. These policies are built from two main parts: Assignments that define the scope of the policy, and Access Controls that define the action to take.
Assignments determine who the policy applies to and what it protects. You target users, groups, or directory roles, and can also include workload identities like service principals. You then select the cloud applications, such as Microsoft 365 or your own apps, that the policy will guard. Finally, you can define trusted network locations, like your corporate IP range, to influence whether access is granted or requires extra verification.
Conditions are the "if" statements that trigger the policy's controls. The system evaluates real-time signals during a sign-in attempt. Key conditions include Sign-in Risk, which detects suspicious activity like login attempts from unusual locations, and Device Platforms, which lets you apply different rules for Windows, iOS, or Android. You can also filter based on the Client Apps being used, such as browsers or mobile apps, and apply Filters for Devices to target specific device states or attributes.
Access controls are the "then" actions the policy takes. You can configure a policy to Grant Access only if users meet additional requirements, such as completing Multi-Factor Authentication (MFA), using a compliant device managed by Intune, or accepting a Terms of Use agreement. Alternatively, you can choose to Block Access entirely if the conditions are not met, though this should be used carefully to avoid locking out legitimate users.
Implementing Conditional Access requires careful planning because policies are evaluated together. If multiple policies apply to a user, all grant controls must be satisfied for access to be approved. A misconfigured policy can block critical applications or disrupt business workflows. To mitigate this risk, you can deploy policies in report-only mode first. This mode logs the policy's outcome without enforcing it, allowing you to review the impact and fine-tune the conditions before turning on enforcement.