Final Answer:
To enforce Microsoft Azure Multi-Factor Authentication (MFA) through conditional access for users not physically present in the office, configure a Conditional Access policy in Microsoft 365 that includes the condition "Locations" and set it to exclude the main office's IP range. Then, within the policy, enable the "Grant" control and select "Require multi-factor authentication."
Step-by-step explanation:
To achieve the desired outcome, you need to create a Conditional Access policy in Microsoft 365 that specifies the conditions under which multi-factor authentication (MFA) should be enforced. In this case, the condition to focus on is "Locations." By configuring this condition to exclude the IP range of the main office, you ensure that MFA is enforced only for users accessing resources from locations outside the office.
The Conditional Access policy's "Grant" control is then configured to require multi-factor authentication. This means that when a user attempts to access Microsoft 365 services from a location other than the main office, they will be prompted to complete the MFA process before gaining access. This additional layer of security helps protect against unauthorized access, especially when users are not physically present in a trusted location.
It's crucial to define the appropriate IP range for the main office accurately to avoid inadvertently applying MFA requirements to users within the office. This setup enhances security for remote or external access while ensuring a seamless and secure experience for users physically present in the main office.