@DBa2b,Thanks for posting in Q&A.
From your description, I know the PowerShell and other background processes were blocked.
To clarify this issue, please do some checks.
1.Please provide us the popping up message.
2.Please check if there are any GPO policies that may block PowerShell.
https://www.thewindowsclub.com/find-all-applied-or-enabled-group-policy-settings-in-windows-10
Non-official, just for reference.
3.Please check if there are any Intune policies in Intune portal or client device that may block PowerShell.
https://doitpsway.com/get-all-intune-policies-using-powershell-and-graph-api
Non-official, just for reference.
If there is anything unclear, feel free to let me know.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.