Endpoint - Set-UdElement

I am trying to do a site location up/down. However, I can’t get the paper color to changed. Any suggestions.

New-UDEndpoint -Schedule $EndpointSchedule -Endpoint {
if (Test-Connection 172.20.16.1 -Count 1 -ErrorAction SilentlyContinue) {Set-UDElement -Id ‘Sallisaw’ -Style @{backgroundColor = ‘green’}} else {Set-UDElement -Id ‘Sallisaw’ -Style @{ backgroundColor = ‘red’}}

}

New-UDGrid -Item -ExtraSmallSize 3 -Content {

    New-UDPaper -Id 'Sallisaw' -Content { 

        "Sallisaw - 172.20.16.1"

         } -Elevation 2

}
Product: PowerShell Universal
Version: 1.4.6