Test-connection for remote pcs - powershell

Question

I have the following powershell with the aim of collecting a reg value from a list of remote machines, Ive tried using a test-connection to speed up process where devices are not online but the test-connection fails for all....
Here is the script:
clear
$servers = Get-Content -Path C:\ukdeviceswin10.txt
$PatternSID = 'S-1-5-21-\d+-\d+\-\d+\-\d+$'
$ProfileList = ForEach ($server in $servers)
{ if(test-connection $server -quiet -count 1)
{
invoke-command -computername $server {gp 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList\*' | Where-Object {$_.PSChildName -match $PatternSID} |
Select #{name="SID";expression={$_.PSChildName}}}}
foreach ($profile in $profilelist) {
$profile = $profile -replace ".$"
$profile = $profile.substring(6,46)
$profile = $profile -replace "[;]"
$profile = $profile -replace "[ ]"
$profiletest = $profile.substring(0,8)
if ($profiletest -eq "S-1-5-21"){
$Reg = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey([Microsoft.Win32.RegistryHive]::Users, "$server")
$profilekey = $profile + "\\SOFTWARE\\Microsoft\\Office\\Outlook\\Addins\\CofenseOutlookReporter.AddinModule"
$RegKey= $Reg.OpenSubKey("$profilekey")
if ($regKey -eq $null){} else {$LoadbehaviourVersion = $RegKey.GetValue("LoadBehaviour")
$results = $server + " " + $profile + " " + $LoadbehaviourVersion | out-file -filepath c:\dell\regresults.txt -Append
}
$RegKey=""
$LoadbehaviourVersion=""
}
}
}