Start and Taskbar Layout XML not working.

<LayoutModificationTemplate
xmlns:defaultlayout="http://schemas.microsoft.com/Start/2014/FullDefaultLayout"
xmlns:start="http://schemas.microsoft.com/Start/2014/StartLayout" Version="1"
xmlns="http://schemas.microsoft.com/Start/2014/LayoutModification">
  <LayoutOptions StartTileGroupCellWidth="6" />
  <DefaultLayoutOverride>
    <StartLayoutCollection>
      <defaultlayout:StartLayout GroupCellWidth="6" />
    </start:Group>
      </defaultlayout:StartLayout>
    </StartLayoutCollection>
  </DefaultLayoutOverride>
	<CustomTaskbarLayoutCollection>
      		<defaultlayout:TaskbarLayout>
        		<taskbar:TaskbarPinList>
				<taskbar:UWA AppUserModelID="MSEdge" />
				<taskbar:UWA AppUserModelID="Microsoft.Windows.Explorer" />
 			</taskbar:TaskbarPinList>
     		</defaultlayout:TaskbarLayout>
   	 </CustomTaskbarLayoutCollection>
</LayoutModificationTemplate>