Explanation:

The policy needs to be applied to Group4 so we need to configure Users and Groups.
The Access controls are set to Block access

We therefore need to exclude compliant devices.
From the scenario:
Ensure that the users in a group named Group4 can only access Microsoft Exchange Online from devices that are enrolled in Intune.
Note: When a device enrolls in Intune, the device information is updated in Azure AD to include the device compliance status. This compliance status is used by conditional access policies to block or allow access to e- mail and other organization resources.
References:
https://docs.microsoft.com/en-us/azure/active-directory/conditional-access/overview
https://docs.microsoft.com/en-us/azure/active-directory/conditional-access/conditions
https://docs.microsoft.com/en-us/intune/device-compliance-get-started