What is a key requirement for a company using Desktop SSO to sync Active Directory passwords with SWA applications?

For a company to implement Desktop SSO (Single Sign-On) that syncs Active Directory (AD) passwords with Secure Web Authentication (SWA) applications, the installation of the Active Directory Password Sync Agent is essential. This agent facilitates the synchronization of users' AD passwords with various SWA applications, ensuring that when users change their Active Directory password, that change is reflected in their SWA applications as well. This capability not only improves user convenience by maintaining a single password for multiple applications but also enhances security by reducing the chances of password fatigue.

The other options do not fulfill the requirements for using Desktop SSO with password synchronization effectively. The requirement for the Active Directory Password Sync Agent is foundational for maintaining the synergy between AD and SWA, which is why it stands out as the correct choice. Moreover, while using only cloud applications might seem relevant, it does not impact the need for an agent. Similarly, the notion that only service accounts would require password sync is too narrow, as regular user accounts also need this functionality. Lastly, while frequent password changes can be a security best practice, they are not a requirement for password synchronization to occur. Thus, the presence of the Active Directory Password Sync Agent is a critical component for successful implementation.