Remove Manager Attribute via PS

Hi experts,

I am trying to remove/delete manager information from the moved users OU, and the PS script is working for single user as below but while i am trying to search for moved OU in the domain, and try to remove manager information for all users those belong to that OU returning with error, could you please advise.

Working script

Set-ADUser ittest -manager $null

The below script is not working:

$Server = "dc01.test.com"
$SearchBase = "OU=Moved Users,DC=test,DC=com"
Get-ADUser -Identity * -Server $Server -SearchBase $SearchBase -Properties * |
Select-Object -Property | Set-ADUser -manager $null

ERROR:

Get-ADUser : Parameter set cannot be resolved using the specified named paramet
ers.
At line:1 char:11
+ Get-ADUser <<<<  -Identity * -Server $Server -SearchBase $SearchBase -Propert
ies * |
    + CategoryInfo          : InvalidArgument: (:) [Get-ADUser], ParameterBind
   ingException
    + FullyQualifiedErrorId : AmbiguousParameterSet,Microsoft.ActiveDirectory.
   Management.Commands.GetADUser
Could you please advise.
ipsec600Asked:
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Rajitha ChimmaniSpecialized Technology AnalystCommented:
Identity * will not work to get all users. You have to provide a filter to list all objects. Try this. I have not tested it though.

Get-ADUser -Server $Server -SearchBase $SearchBase -Properties * -Filter {ObjectType -eq "User"} | Set-ADUser -manager $null
ipsec600Author Commented:
Hi Rajitha,

Thank you for your reply, now the PS command become successful without returning any error but it is not removing Manager information for users, could you please advise.
Rajitha ChimmaniSpecialized Technology AnalystCommented:
Try this. I would recommend trying $null in double quotes for single user first.

Get-ADUser -Server $Server -SearchBase $SearchBase -Properties * -Filter {ObjectType -eq "User"} | Set-ADUser -manager "$null"
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footechCommented:
You can use the following.  There is no need to return all the properties as you aren't doing anything with them, and it will just slow the query down.
Get-ADUser -Filter * -Server $Server -SearchBase $SearchBase | Set-ADUser -Clear Manager
#this also works
Get-ADUser -Filter * -Server $Server -SearchBase $SearchBase | Set-ADUser -Manager $null

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footechCommented:
BTW, Rajitha's doesn't work because the filter is incorrect.  It should be {ObjectClass -eq "User"} but that's also unnecessary since all objects that Get-ADUser returns have an ObjectClass of User.
Rajitha ChimmaniSpecialized Technology AnalystCommented:
I agree that the filter is incorrect but -Filter is a required parameter for Get-ADUser. You might not be able to run it without providing some filter.
footechCommented:
My example does provide a filter, "*", which is valid and works.
Get-ADUser requires one of the following parameters: -Identity, -Filter, or -LdapFilter
ipsec600Author Commented:
Excellent!! The PS command works perfectly that I was expecting, Thank you footech. And also thanks to Rajitha!!
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