Amazon Bedrock "Operation not allowed" for ALL models despite full IAM permissions

Question

I am unable to invoke ANY Amazon Bedrock model (Nova, Claude, Llama, Gemma) 
in us-east-1. All return the same error:

"ValidationException: Operation not allowed"

What I have already done:
- IAM user has: AmazonBedrockFullAccess, AmazonBedrockMarketplaceAccess, 
  AWSMarketplaceFullAccess, AWSMarketplaceManageSubscriptions
- Console shows: "Access to all serverless models is enabled by default"
- Same error in Playground, boto3, and AWS CLI
- Support case opened 4 days ago, no response (Basic Support plan)
- Account has $160 in AWS credits

This appears to be a backend account-level restriction. 
How can I get this unblocked?

Riku_Kobayashi · Answer

Hello.

As indicated in the answer below, the issue may not be due to IAM permissions, but rather to operations performed on an AWS account without a payment history.  
Since your AWS account is likely newly created, you've probably made most payments via free credit, so it's highly probable that you haven't actually been charged yet.  
I assume you've already contacted AWS support, so it would be best to wait for their response.  
https://repost.aws/questions/QULXR6KB3KTmGN-3J3maUauA/validationexception-operation-not-allowed-when-invoking-amazon-bedrock-model-in-playground#ANu2UuxaBlRuaqq1Yt-KtfSw

Amazon Bedrock "Operation not allowed" for ALL models despite full IAM permissions

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