Many customers have switched from Group Policy as a means for managing policies for Microsoft 365 Apps for enterprise on Windows devices, to the Cloud Policy service which allows administrators to configure policies for a large number of Microsoft 365 apps and services, including full support for Microsoft 365 Apps for enterprise on Windows as well as the other platforms, from a single administration experience. If an application calls the Windows API, the policy will be included as some of the Office apps running on Windows support that policy. Part 1 for troubleshooting Cloud Policy service was written when the Cloud Policy service only supported Microsoft 365 Apps for enterprise running on Windows. While this information is still useful for that scenario, especially for the information regarding how Cloud Policy uses the registry, you may want to call the check-in APIs directly so you can review the responses that are being provided to the applications that call the service. Important: Policy configurations in the Cloud Policy service are targeted to users using group membership. Multiple policy configurations can be targeted to multiple groups and conflicting policy settings are managed by the priority values, so make sure you have reviewed the user's group memberships before troubleshooting. The Cloud Policy service uses a cache on the service side to improve performance for multiple calls for the same user from multiple applications.
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Source: Microsoft Tech Community Microsoft 365 Blog
