Cannot validate argument on parameter 'Identity'.

Question

At:

$Users = Get-ADUser -filter * -Properties Manager | Where-Object { $_.Enabled -Match "false"} $Manager When manager is empty, how can we avoid: Cannot validate argument on parameter 'Identity'. The argument is null. Provide a valid value for the argument, and then try running the command again.

Answer 1

If you want all disabled users, regardless of the presence of an assigned manager, then try this code:

$Users = Get-ADUser -filter "enabled -eq 'false'" -Properties Manager | 
        ForEach-Object{
                if ($manager){
                        Select-Object Name,samAccountName, @{n="ManagerName";e={(get-aduser $_.manager).samaccountname}}
                else{
                        [PSCustomObject]@{
                                Name = $_.Name
                                samAccountName = $_.samAccountName
                                ManagerName = "No manager assigned to this user"
                        }
                }
        }

Answer 2

Your code doesn't make sense. You haven't declared $Manager to be a variable. Did you mean something like this:

$Users = Get-ADUser -filter "enabled -eq 'false' -and manager -like '*'" -Properties Manager | 
        Select-Object Name,samAccountName, @{n="ManagerName";e={(get-aduser $_.manager).samaccountname}