Edge Kiosk idle timeout

Hi

I am trying to implement an idle timeout for Edge running in kiosk mode

I am using Edge Chromium to run as a custom interface via group policy with the following command line: ( using canary to test the kiosk features)

I Cannot get the idle-timeout-minutes to work. When testing it, I log into the kiosk website and my user session never resets. I have set it to 1 minute for testing but I am still logged in after this time

The docs page here https://docs.microsoft.com/en-us/deployedge/microsoft-edge-configure-kiosk-mode. Doesnt show an example.