Web Reference: Your user, or the role that you assume, must have permission to invoke a function. This requirement also applies to Lambda functions and other compute resources that invoke functions. Add the AWS managed policy AWSLambdaRole to your user, or add a custom policy that allows the lambda:InvokeFunction action on the target function. To grant Lambda execution role permissions, you list service-specific API actions, such as s3:GetObjec t or sns:Publish, in the Action element of an IAM policy statement. Then, you attach the policy to an IAM execution role that your Lambda function assumes when it's invoked. Nov 4, 2025 · This comprehensive guide details the most common invocation failures, ranging from IAM permission issues and VPC connectivity problems to resource constraints like memory exhaustion and function timeouts.
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