Trusted Sites not working in GPO Setting Internet Explorer Maintenance

I had a problem with setting trusted and restricted web sites using the GPO setting under Internet Explorer Maintenance.

I was adding sites to the IE trusted zones but the policy setting failed to take effect.

Resolution
If the GPO setting "Site to Zone Assignment" is used it can prevent settings in Internet explorer maintenance taking effect (see MS Articles 919748 & 918915)

The site to Zone assignment can be set in both user and computer config area.
Note : Computer config has a setting to ignore User settings (a gotcha)