Looking at the doc: https://access.redhat.com/documentation/en/red-hat-openstack-platform/9/paged/upgrading-red-hat-openstack-platform/chapter-3-director-based-environments-performing-upgrades-to-major-versions Section 3.4.2: The following line in the given example appears twice: -e /usr/share/openstack-tripleo-heat-templates/environments/network-isolation.yaml \ One needs to be removed. Thanks.
Dual network-isolation file no longer appears: https://access.redhat.com/documentation/en/red-hat-openstack-platform/9/paged/upgrading-red-hat-openstack-platform/chapter-3-director-based-environments-performing-upgrades-to-major-versions Thanks, Alex!