A. Check the Amazon S3 bucket policy. Verify that the policy allows the config.amazonaws.com service to write to the target bucket. Most Voted
B. Verify that the IAM entity has the permissions necessary to perform the s3:GetBucketAcl and s3:PutObject* operations to write to the target bucket. Most Voted
C. Verify that the Amazon S3 bucket policy has the permissions necessary to perform the s3:GetBucketAcl and s3:PutObject* operations to write to the target bucket.
D. Check the policy that is associated with the IAM entity. Verify that the policy allows the config.amazonaws.com service to write to the target bucket.
E. Verify that the AWS Config service role has permissions to invoke the BatchGetResourceConfig action instead of the GetResourceConfigHistory action and s3:PutObject* operation.