Dynamicparam for windows service?

Good day,
I was recently attempting to simplify a script for users and thought gathering a list of the available services would be the best route. The function base will have a param for computername and dynamicparam for the service names.
However i cant seem to gather the list from a remote computer the list only shows the services on my local machine. Has anyone run into this before or something similar and if so have thoughts or options?
The code i have to start is

function Get-WindowService
    Param (
        # ComputerName
        $ComputerName = $env:COMPUTERNAME
    DynamicParam {

        $attributes = new-object System.Management.Automation.ParameterAttribute
        $attributes.ParameterSetName = "__AllParameterSets"
        $attributes.Mandatory = $true
        $attributes.Position = 1
        $attributeCollection = new-object -Type System.Collections.ObjectModel.Collection[System.Attribute]

        $Values = (Get-CimInstance -ClassName win32_service -ComputerName $ComputerName).name       

        $ValidateSet = new-object System.Management.Automation.ValidateSetAttribute($Values)


        $dynParam1 = new-object -Type System.Management.Automation.RuntimeDefinedParameter("ServiceName", [string], $attributeCollection)

        $paramDictionary = new-object -Type System.Management.Automation.RuntimeDefinedParameterDictionary

        $paramDictionary.Add("ServiceName", $dynParam1)

        return $paramDictionary 

    Begin {
        $ServiceName = $PSBoundParameters.ServiceName
    Process {
    End {

You can’t just access remote host without telling it who you are, right? you need to provide user name and password of a user account on remote host that is member of Administrators group.

Update your Get-CimInstance as follows:

    $Cred = Get-Credential -Message "Credentials are required to access $ComputerName"
    $CimServer = New-CimSession -ComputerName $ComputerName -Credential $Cred
    $Values = (Get-CimInstance -ClassName win32_service -CimSession $CimServer).name       

You need to run your function as Administrator as well.