Hello Mark,

We suspect the issue is caused by following factors:

1.A specific software block it.
2.System file corrupt.

Given the situation, it is recommended to test the issue in Safe Mode.
Thank you for your cooperation.

Windows Time service will not work under Safe Mode by default. To make
Windows Time work under Safe Mode, you need to create a registry entry for
Safe Mode you are logged in to.

1.Start the computer in Safe Mode with network.
2.Click Start, type CMD and press Enter.
3.Please run the following commands one by one.

REG ADD "HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Network\W32time"
/VE /T REG_SZ /F /D "Service"

net start w32time

4.Then, Windows Time service will be started.

Please test the issue by UI. Does it work?

If the issue still persist, we will focus on the system file next time.

Thanks.

Best regards,

Robinson Zhang
Microsoft Online Support