Indeed it does appear that your account is correctly linked. Can you please submit a ticket at http://support.ubi.com with a screenshot showing your Prime tab, so that we can help you get that loot?
@UbisoftSupport New problem trying to claim @Twitch Prime goodies... Says my account isn't linked, but it's been linked for a while.pic.twitter.com/9XRMCqHZzS
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