https://cdn.redhat.com/content/dist/rhel/server/7/7Server/x86_64/openstack/13/os/repodata/repomd.xml: [Errno 14] HTTPS Error 404 - Not Found

I have installed RHEL 7.5. My purpose is to install OpenStack Queens using packstack.
I have enabled rhel-7-server-openstack-13-rpms:
subscription-manager repos --enable=rhel-7-server-openstack-13-rpms

Then, I have run:
yum repolist

and it shows the following error:
https://cdn.redhat.com/content/dist/rhel/server/7/7Server/x86_64/openstack/13/os/repodata/repomd.xml: [Errno 14] HTTPS Error 404 - Not Found
Trying other mirror.

Although I have followed the instructions from https://access.redhat.com/articles/1320623, I couldn't enable this repo for OpenStack Queens in my setup.

I have disabled this repo:
subscription-manager repos --enable=rhel-7-server-openstack-13-rpms

Then I have enabled rhel-7-server-openstack-12-rpms:
subscription-manager repos --enable=rhel-7-server-openstack-12-rpms

yum repolist works ok when rhel-7-server-openstack-12-rpms. So the problem is related to rhel-7-server-openstack-13-rpms.

Can you please let me know what can I do to enable rhel-7-server-openstack-13-rpms repo?

Thanks,
Anda