Screensaver And Monitor Power Off Never Happens

Hi Guys

I'm testing some Dell Wyse Thin clients that are joined to a Dell Wyse Management System, where they receive all their configuration settings.

I have set a policy so that the monitors power off to standby after 10 minutes, however the monitor's power on 24/7

Not sure the root cause - have updated the BIOS to the latest and just upgraded to the recently released ThinOS 8.6.028 (And downgraded to earlier releases in the 8.5 release)

The policy is set under Display>Screen Saver SettingsThe logs on the Wyse client indicates it is receiving all the settings fine, and the same applies whether it is logged into an RDP session or simply powered on and not logged into anything the screens just stay on.

Does anyone have any ideas or workarounds?