@Gizmoyou and I share the same sentiment about Kazoo... and I think at this point the same issue as well LOL. Documentation is pretty clear, I have tried many things. I normaly create VMs in my own baremetal server, but at this time, to try something new, I have created a VPS based in US to validate that it was not related to a geofencing, but I have the same problem. Are you able to make progress to some point?
I realized that you are getting no errors with the "yum install -y https://packages.2600hz.com/centos/7/stable/2600hz-release/4.3/2600hz-release-4.3-0.el7.centos.noarch.rpm" command. However, I can't even get it to run,, look my results.
[root@sandbox ~]# yum install -y https://packages.2600hz.com/centos/7/stable/2600hz-release/4.3/2600hz-release-4.3-0.el7.centos.noarch.rpm
Loaded plugins: fastestmirror
Cannot open: https://packages.2600hz.com/centos/7/stable/2600hz-release/4.3/2600hz-release-4.3-0.el7.centos.noarch.rpm. Skipping.
Error: Nothing to do