ArgumentList parameter in Invoke-Command don't send all array
You solution is to pass it like (,$servicesList)
$session = New-PSSession -ComputerName .$servicesList = "Service1", "Service2", "Service3"Invoke-Command -ScriptBlock { Param ([string[]]$newServicesList) Write-Host $newServicesList} -ArgumentList (,$servicesList) -Session $sessionRemove-PSSession $sessionpossible explanation from this SO answer.