Prepoluate a Global Access List in exchange 2013

Is there anyway to repopulate a newly created GAL with all the users that meet the criteria of the recipient filter?
currently I have it set to use "CustomAttribute15 -eq ''" and everyone who should see this GAL has that set however they don't show up in the GAL til they log in with the new address policy.
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Crossroads305Author Commented:
Nevermind, I knew the answer to my own question I just had a phantom character in my command. 'Update-GlobalAddressList -Identity "NewGal"' worked for me

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