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First, you should check your code. IaC frameworks like AWS SAM and AWS CDK are usually pretty good in keeping your Lambda functions supplied with sane permissions. If you don't know what you're doing, you can create security vulnerabilities. Also, if you create a custom role for CloudWatch logging, it won't allow access to services that your Lambda function might need to do its real work, like DynamoDB or S3. This means you need to include permissions for those services manually too.
First, you should check your code. IaC frameworks like AWS SAM and AWS CDK are usually pretty good in keeping your Lambda functions supplied with sane permissions. If you don't know what you're doing, you can create security vulnerabilities. Also, if you create a custom role for CloudWatch logging, it won't allow access to services that your Lambda function might need to do its real work, like DynamoDB or S3. This means you need to include permissions for those services manually too.