Amazon uses the address on the Manage My Kindle webpage to determine geo availability, but then they also seem to sometimes run random checks on payment methods and IP numbers.
It is a mystery.
Many people go along fine for awhile, then they get blocked --- sometimes if they wait awhile it will start working again.
Maybe find a different VPN server and get a new US IP number?
Geo Restrictions are terrible and I have to think a #1 cause of people thinking "blank this" I can steal the book from the darknet in under 20 seconds.
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