Set-ADGroup cannot find group created earlier in script (PowerShell)

I'm working on a script to create Security and Distribution groups so that they will follow our naming standards. In the script I use New-DistributionGroup to create the group, Set-DistributionGroup to add some Custom attributes, and then want to use Set-ADGroup to add a Description. (aside: what a pain that New-DistributionGroup can't do these things!) Despite setting sleep times up to 30 seconds, Set-ADGroup always fails with:

Set-ADGroup : Cannot find an object with identity: 'AcctTesting1' under: [our domain].
Yet if I remove the line of code from Set-ADGroup, run the script, and then immediately run the Set-ADGroup code, it works perfectly.

Here is the relevant portion of the script: (our domain name removed)

    $GroupTypeName = "Assignment"
    $OU = $BaseOU + "AssignmentGroups"
    New-DistributionGroup -Name $SAMname -Alias $Alias -DisplayName $DisplayName -ManagedBy `
        "CN=Administrator,CN=Users,[our domain]" -OrganizationalUnit $OU `
        -SamAccountName $SAMname -Type Security
    Set-DistributionGroup -Identity $SAMname -CustomAttribute10 "ASSIGNMENT GROUP" `
        -CustomAttribute11 $PRMCode
    echo "Waiting for new group to replicate"
    Start-Sleep -s 20
    Set-ADGroup -Identity $SAMname -Description "$Alias AssignmentGroup"

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I'm relatively new to PowerShell scripting, so if you have ideas on how to fix this, I'd appreciate a little detail!

Dann
danncoxInfrastructure AdministratorAsked:
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KenMcFCommented:
How many Domain Controllers do you have?

You could try to use the -Server and -DomainController switches

The -server is used with the set-adgroup

-DomainController is used with the new-distrobution group cmdlet

Or another thing you could do is a loop using get-adgroup to verify the group exists before using set
0
danncoxInfrastructure AdministratorAuthor Commented:
I did try specifying the DC (we have three in this, our main site) - forgot to mention that.

Can you show me how that loop might look?

Thanks!
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KenMcFCommented:
without testing try something like this. You will probably get errors when running becuase it can not find the group at first. You could use try\catch to remove the errors. I can test later.

Do {
$r = Get-adgroup test123
}
Until(
($r | Measure-Object).count -ge 1
)
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danncoxInfrastructure AdministratorAuthor Commented:
Thanks,

I'll have to give that a try tomorrow - time to go home, now!
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danncoxInfrastructure AdministratorAuthor Commented:
KenMcF,
Your solution, above, worked, but Get-ADGroup throws an error message which cannot be suppressed with ErrorAction or WarningAction SilentlyContinue.

Doing some more searching, I found information on StackOverflow (http://stackoverflow.com/questions/6307127/hiding-errors-when-using-get-adgroup), and used it to do this:
Write-Host -NoNewline "Waiting for replication"
Do
    {
	If($Idx -gt 0) {Start-sleep -s 5}
	$r = Get-ADGroup -Filter {SamAccountName -eq $SAMname}
	Write-Host -NoNewline "."
	$Idx = $Idx + 1
    }
Until($r)

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This does the trick.  I've found, by playing with which DC handles the job, that the number of attempts can vary from one to fifteen.  However the DC that's fastest before lunch may be slowest after lunch...

Anyway, your idea got me on the right track, so thanks!
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danncoxInfrastructure AdministratorAuthor Commented:
Solution posted by KenMcF worked, with some problems, but led me on the path to find my own solution.  I hope I've done this right, to award all the points to KenMcF.
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