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Making sure that I do not have a credit card connected to the account
That's where you went wrong. You do have to have a credit card connected to the account, and the card must have a US address. But, provided you have a positive balance on your gift certificates, the card will never be charged.
The idea is that you enter a fictitious US address for the card. That should cause no harm, provided you never try to charge any purchases to it.
Note that the above doesn't apply to magazine subscriptions. If you attempt to subscribe to a magazine, Amazon will try to charge the card, not the gift certificates, and the purchase will be rejected.
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