The CSR heard the promo code 6664 and mentioned that he had just transferred someone else earlier to Membership Rewards desk. He proceeded to slowly read the terms of the offer (matching the details in this thread), verified my PR Gold Card account was opened last month, and noted my account is not coded with the promo, then insisted the only thing he could do was transfer to Membership Rewards.

The MR rep did not need to ask or hear anything, immediately said that it is only for new accounts opened with this offer, a 16-digit RSVP code is required to be used when applying for the account (presumably this is embedded in the link used to apply and codes the account with promo code).

I asked for promo 5721 for 10K points per AU and was immediately told it is only for international accounts. When I asked what does that mean ;-), she said account address must be in Argentina, Brazil, etc (alphabetical list of countries?)