genisoimage: Directories too deep

I am trying to apply GPO backup at the end of the unattended install. Found the cd_files was never being created because the directory is too deep. How can I get genisoimage to use the Rock Ridge extensions? I've redacted the full file path for security.

vsphere-iso: Creating CD disk...
vsphere-iso: Warning: creating filesystem with Joliet extensions but without Rock Ridge
vsphere-iso: extensions. It is highly recommended to add Rock Ridge.
vsphere-iso: I: -input-charset not specified, using utf-8 (detected in locale settings)
vsphere-iso: genisoimage: Directories too deep for '/tmp/packer_to_cdrom4164509235/ (7) max is 6; ignored - continuing.
vsphere-iso: genisoimage: To include the complete directory tree,
vsphere-iso: genisoimage: use Rock Ridge extensions via -R or -r,
vsphere-iso: genisoimage: or allow deep ISO9660 directory nesting via -D.
vsphere-iso: genisoimage: Directories too deep for '/tmp/packer_to_cdrom4164509235/