Bedrock Marketplace agreement for Claude Sonnet 4.6 created then instantly expires — INVALID_PAYMENT_INSTRUMENT despite valid payment method

The "INVALID_PAYMENT_INSTRUMENT" error you're encountering when trying to invoke Claude Sonnet 4.6 through Amazon Bedrock indicates that the automatic AWS Marketplace subscription process is failing during the first invocation attempt. When you invoke a third-party model in Amazon Bedrock for the first time, the service automatically initiates an AWS Marketplace subscription. If this subscription cannot be completed, subsequent invocations will continue to fail with access denied errors.

Based on the behavior you're describing—where Marketplace agreements are being created but immediately expiring—this suggests an issue with the subscription provisioning process itself rather than a typical IAM permissions problem. The fact that you've verified multiple valid payment methods and that AWS Support has confirmed the payment method isn't the root cause points to a more complex provisioning issue.

For this type of situation where the automatic subscription mechanism appears to be malfunctioning, I'd recommend adding detailed correspondence to your existing case through the AWS Support Center (https://console.aws.amazon.com/support/). Include the specific timestamps of the failed subscription attempts, the agreement IDs from your Marketplace notification emails, and emphasize that this is blocking your ability to use the service entirely. You might also consider reviewing your AWS Support plan options, as higher-tier plans provide faster response times and access to more specialized technical resources for complex issues like subscription provisioning failures.

It's worth noting that after a subscription successfully completes, it can take up to 2 minutes before the model becomes accessible, and you may continue to see access denied errors during that brief window. However, the instant expiration pattern you're seeing is clearly abnormal and requires investigation by the AWS Marketplace and Bedrock teams.
Sources
Resolve AWS Marketplace permission errors in Bedrock | AWS re:Post