Hi StevenY_81,
Thank you for posting in the Microsoft Community Forums.
May I ask under which path did you set the policy?
Which policy exactly is set?
What exactly is the error returned by the PowerShell command?
Is there an error reported in the Event Viewer? What are the details of the error?
All of these things need to be known.
You said that the policy was not applied to all users, so did any users successfully apply the policy?
Is there a difference between those users and those who did not apply the policy?
Is it because of different user configurations.
Best regards
Neuvi Jiang