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I'm experiencing the same issue. I disabled Pi-hole and any content blockers on my device and the network. Still seeing the issue on mobile and desktop. For me it's while ordering through Amazon's Whole Food 2-hour delivery service. Haven't tried Amazon.com checkout.

[Edit] Figured it out, clear your cookies folks.

Broken here too

check for any adblockers, and reload without them running. I remember uBlock Origin interfering with Amazon before

I just tested an Amazon purchase with Firefox and uBlock Origin, and it works OK - "Proceed to checkout" takes me to the checkout page, as expected.

Amazon Checkout Is Broken