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Home » AWS Bedrock Error: How to Fix ValidationException During InvokeModel

AWS Bedrock Error: How to Fix ValidationException During InvokeModel

Emily Smith by Emily Smith
May 2, 2026
in How To
Reading Time: 2 mins read
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If you’ve run into a problem where Amazon Bedrock isn’t working as expected, even though IAM and SCP settings seem correct, you might be facing an issue with Bedrock not being activated. This situation can prevent you from using Bedrock as an AWS service.

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The good news is that inquiries about account and billing issues are free when you contact AWS Support. To get help, visit the support page at this link: https://support.console.aws.amazon.com/support/home#/. When submitting your question, it’s best to choose a category similar to the one shown in the example image. This helps direct your inquiry to the right support team.

It’s also important to note that the “model access” feature in AWS Bedrock’s AI-powered response system has been discontinued. So, it can no longer be used. Instead, Amazon Bedrock now offers immediate access to all serverless foundation models by default, no setup required. This means you can start using these models right away through the Bedrock console, SDK, and features like Agents, Flows, Guardrails, Knowledge Bases, Prompt Management, and Evaluations.

Sometimes, when you run a third-party model from Bedrock for the first time, you might see it fail. This can happen because of subscription issues. When you invoke a third-party model for the first time, Amazon Bedrock automatically starts the subscription process in the background. During this setup (which can take up to 15 minutes), your API calls might succeed briefly while the system works in the background. If some required permissions or prerequisites are missing, the subscription will fail, and future API calls will return an AccessDeniedException.

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To prevent this problem, make sure to check all the prerequisites before you start using models in production. These include:

– IAM permissions for your role: aws-marketplace:Subscribe, aws-marketplace:Unsubscribe, and aws-marketplace:ViewSubscriptions.
– For Anthropic models, you must complete the First Time Use (FTU) form before invoking the model.
– Your AWS account needs to have a valid payment method set up for AWS Marketplace purchases.

By ensuring these steps are completed first, you can avoid subscription issues and use your models smoothly from the start.

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Emily Smith

Emily Smith

Emily is a digital marketer in Austin, Texas. She enjoys gaming, playing guitar, and dreams of traveling to Japan with her golden retriever, Max.

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