Sorry to Hijack!
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However, if the primary cardholder of the American Express Gold and Blue accounts are the same person these two cards should be linked to the same Rewards account, and all the points are treated as "Membership Rewards". If this did not happen automatically you can ask American Express to fix it.
I just tried doing this and they told me they could not combine Membership Rewards and Membership Rewards Express accounts. I have Blue Gold and Platinum. All under the same name, all linked on website. Some specific place I should be contacting? I tried the secure message center.