Web Reference: To resolve the error, you must reset the AWS KMS grant for the function's execution role. Note: The IAM user that creates and updates the Lambda function must have permission to use the AWS KMS key. Mar 18, 2025 · Xi shows you how to resolve "KMSAccessDeniedException" errors from AWS Lambda | Amazon Web Services. 0:00 Introduction 0:24 Identify the exact error message 1:12 Error "KMS Exception ... Key trust determines whether you should trust a KMS key that you are permitted to use. In general, you trust the resources in your AWS account. But, you can also feel confident about using KMS keys in a different AWS account if a grant or IAM policy in your account allows you to use the KMS key.
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