Unable to get valid subscription for VMs

We have two datacenters, each with their own VMware hypervisors that we need to subscribe RHEL 7 VM's on. For the one datacenter, everything is working fine. However, in the other one, things are a bit strange. I was able to register & subscribe the VM on which virt-who is running, but any other VM I spin-up and register/subscribe only gets a 24hr temporary subscription. I've tried:

subscription-manager remove --all
subscription-manager register
subscription-manager attach --auto

... but the VMs still come up with a temporary (24hr) subscription. If I run "subscription-manager list --consumed" I see this (other lines showing account details removed):

Service Level: Standard
Service Type: L1-L3
Status Details: Guest has not been reported on any host and is using a temporary unmapped guest subscription.
Subscription Type: Stackable (Temporary)
Starts: 08/27/2016
Ends: 12/20/2016
System Type: Virtual

The VMs are put on the same hypervisor as the one that is running virt-who and was successfully registeres/subscribed, so I'm not really sure why additional VMs won't subscribe. We have a total of 24 subscriptions and only 4-5 are currently being used, so not enough subscriptions isn't the issue. Any idea? I can post the /var/log/rhsm/rhsm.log contents if need be. Thanks.