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There could be several reasons for an AWS Lambda function encountering an access denied error while attempting to getObject from S3:

1. Incorrect IAM permissions: The AWS Lambda function may not have the required IAM permissions to access the S3 bucket. Ensure that the IAM user or role associated with the function has the necessary S3 permissions (e.g., s3:GetObject) to perform the required actions.

2. Bucket policies: A bucket policy can restrict access to an S3 bucket. Ensure that the AWS Lambda function is allowed to access the S3 bucket by checking the bucket policy.

3. Access keys: The AWS Lambda function may not have valid AWS access keys. Check that the access keys used by the function are valid and have appropriate permissions.

4. Security groups: A security group associated with the S3 bucket may be blocking access from the Lambda function. Check that the Lambda function is allowed to access the S3 bucket by checking the associated security groups.

5. VPC endpoint: If the S3 bucket is in a VPC, then the AWS Lambda function must be associated with the same VPC and subnet as the S3 bucket. Check that the Lambda function is associated with the correct VPC and subnet.

6. S3 region: The S3 bucket may be in a different region than the AWS Lambda function. Check that the AWS Lambda function is in the same region as the S3 bucket.