If this is the account you're using, you're not showing as gold. If you just added the subscription, you may need to give it a little more time to fully update. You may also want to check
http://commerce.microsoft.com to make sure it shows the subscription (if it's a trial subscription it will not work for games with gold).
If you're still having issues with the subscription, you'll need to contact support. 1-800-4my-xbox if you're in the US/Canada or
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