gsutil cp with no-clobber option from GCS to S3 returning access denied error

Hi,

I am using below command to copy files from gcs to s3.

`gsutil -m cp -r -c -n `

This works fine as long as files not present in the destination(s3) i.e., files will be copied if not present. However, if I re-run the same command to copy missing files if any, I am being bombarded with below error for files which are already present but the missing files get copied successfully.

**AccessDeniedException: 403 AccessDenied**

Per my understanding, -n option should ignore files which are already present in the destination from being overwritten again.

If I do the reverse operation i.e., copying from s3 to gcs, gsutil cp -n command is behaving as expected.

The problem is only when copying from gcs to s3.

Please advise on this