Powershell script to restart service

Hello,

We use Citrix and we run into issue's where Desktops unregister. I've installed the xendesktop SDK for powershell scripts and need to get a little of "unregistered desktops" and then from that list retrieve the machine name . Then from there i'd like to iterate through a loop where I use Get-Service to check the status and if it's stopped then start it and if not just restart the service. Below is the code however it is not running for me. It seems like the Get-Service command doesn't like the Array that it's passed. Sorry I'm new to powershell and programming in general. 

##Load Citrix Modules
asnp Citrix.*

#Variables for email
[string[]]$recipients = "xxxxx@xxxxxx.com"
$fromEmail = "xxxxx@xxxx.com"
$server = "itopia-us.mail.protection.outlook.com"
$date= Get-Date

##Check for VMs on and unregistered
$unregisteredVMs = Get-BrokerDesktop -RegistrationState Unregistered | Select MachineName
[string]$emailVMs = Get-BrokerDesktop -RegistrationState Unregistered | Select MachineName | ft -wrap -autosize | Out-String

IF (!$unregisteredVMs) {
##Send all clear email
[string]$emailBody = "There were no powered on desktops in an unregistered state."
send-mailmessage -from $fromEmail -to $recipients -subject " XenDesktop Daily Check - $date" -body $emailBody -priority High -smtpServer $server
}
Else {
##If powered-on and unregistered, perform a forceful restart
foreach ($unregisteredVM in $unregisteredVMs)
{
 $icaservicestate = Get-Service PorticaService -ComputerName $unregisteredVM | select status
IF ($icaservicestate = Stopped) {
Set-Service -Name PorticaService -Status Running
}
Else {
sc \\$unregisteredVM start PorticaService
}
 #Write-Host "Hello, I am unregistered: $unregisteredVM"
}

#Send an email report of VMs to be restarted due to being in an unregistered state
[string]$emailBody = "The following desktops were forcefully restarted due to not registering with the DDCs in a timely manner. `n $emailVMs"
send-mailmessage -from $fromEmail -to $recipients -subject " XenDesktop Daily Check - $date" -body $emailBody -priority High -smtpServer $server
}