Powershell Invoke-Command headache

Writing a powershell script that I can schedule to run automagically, every couple weeks.  Script is to enumerate all servers on the network, enumerate services running with domain accounts, generate a new password, update AD and then update the service.

Through much troubleshooting I've basically identified that one line quite plainly isn't running.  Yet when I do it manually it does run.

I have tried the invocations from two methods, which I assume are transparent, but tested anyways:

$ses=New-PSSession -ComputerName $service.SystemName
Invoke-Command -Session $ses -ScriptBlock {}

#and

Invoke-Command -ComputerName $service.SystemName -ScriptBlock {}

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So, here we go.  New-Password is a string generator that I wrote to meet my password requirements.  The line which I believe is not working correctly is line 11.

		foreach ($service in $managerservices){
			Write-Verbose "Beginning Service $($service.name)"
			$password = New-Password 10
			$secureADpassword = ConvertTo-SecureString -String $password -AsPlainText -force
			Set-ADAccountPassword -Identity $service.StartName.Split("\")[1] -NewPassword $secureADpassword -reset
			Write-Verbose "Invoking on $($service.SystemName)"
			Invoke-Command -ComputerName $Service.SystemName -ScriptBlock {
				param($service,$password)
				$secureServicepassword= ConvertTo-SecureString -String $password -Force -AsPlainText;
				$newservice=get-wmiobject win32_service -filter "name='$($service.name)'";
				$newservice.Change($null,$null,$null,$null,$null,$null,$newservice.StartName,$secureServicepassword,$null,$null,$null);#THIS LINE DOES NOT WORK
				$newservice.StopService();
				$newservice.StartService();
			} -ArgumentList $service,$password
			write-verbose "Adding $($service.Name) to array"
			$servlog = New-Object System.Object
			$servlog | add-member -type NoteProperty -name Server -value $service.SystemName
			$servlog | add-member -type NoteProperty -name Service -value $service.Name
			$servlog | add-member -type NoteProperty -name Username -value $service.StartName
			$servlog | add-member -type NoteProperty -name Password -value $password
			$servicesmanaged+=$servlog;
			
			$MASTERLIST +=$servlog
		}

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I'm probably doing something stupid.  But I can't seem to see it.

Interestingly, the return output for the commands is (apart from the startservice method) entirely what I would expect to see.

It's being tested on a service with a manual startup, presently stopped.

WMI response for the change command is status code 0 (worked?!)
WMI response for the stop command is status code 5 (cannot accept control).  That said, if I start the service, it returns status code 0.
WMI response for the start command is status code 15 (invalid login)

If I manually type the new password into the service via the services.msc I am able to start the service