Urgent Help needed! ADSI can't add local user to local group when there are variables

Question

Hi friends
it about 8 hours i am working on following simple code but no result. i feel i am loosing my eyes
i need to use a code within my PS script to add a Local user to the built-in "Users" Local Group in windows 7 , 8, 2012....
the following code which the username is not related with any variable works fine.
$computer = [ADSI]"WinNT://."
$user = $computer.Create("User","MyLocaluser")
$user.setinfo()
$user.SetPassword("P@ssw0rd")
$Group = [ADSI]"WinNT://./Users,Group"
$Group.Add("WinNT://MyLocaluser,user")
but in the 2 following scenarios (which Variables enter into codes), doesn't work: (for simplicity & be easier to read, i have bolded the only differences in my 3 scenarios for you
Scenario1:
$computer = [ADSI]"WinNT://."
$user = $computer.Create("User","MyLocaluser")
$user.setinfo()
$user.SetPassword("P@ssw0rd")
$Group = [ADSI]"WinNT://./Users,Group"
$Group.Add("WinNT://$user,user")
i checked, user is created but is doesn't become member of local "Users" group
Scenario2 (which is my Real Scenario):
$myVMnumber = read-host "enter your VMnumber"
$computer = [ADSI]"WinNT://."
$user = $computer.Create("User","MyLocalUser$MyVMnumber") ----># for example on VM2, will be created as "MyLocalUser2"
$user.setinfo()
$user.SetPassword("$MyVMnumber") # ---> so that the password of MyLocaluser be the digit 2
$Group = [ADSI]"WinNT://./Users,Group"
$Group.Add("WinNT://$user,user")
what change should make to the code?
Many thanks in advanced

Answer 1

Is there some reason why you are posting the same question in multiple forums?
I gave you the exact answer and a copy of tested code.
Someone needs to merge these two threads:
https://social.technet.microsoft.com/Forums/en-US/98ab1abd-ef62-4b95-b70c-a6f0120a155e/unable-to-add-local-usr-to-local-group-via-adsi?forum=winserverpowershell
¯\_(ツ)_/¯
no it's the same powershell forum not multiple forums
i had posed my question in previous threat
https://social.technet.microsoft.com/Forums/en-US/98ab1abd-ef62-4b95-b70c-a6f0120a155e/unable-to-add-local-usr-to-local-group-via-adsi?forum=winserverpowershell
but at the middle of the scenario, no one continue to investigate on my problem, so i started new threat to investigate on the rest of the problem, but finally you answered it & now this threat can be closed up
many thanks for your helps.