Thank you wbumiller.
I completely forgot about the Proxmox No-Subscription Repositories when I patched the hosts. Added them to /etc/apt/sources.list, rebooted and everything is working great!
Software: proxmox-ve 7.0-2 Fresh install
Storage: CEPH
Hardware: 6 Node cluster all running same version of proxmox-ve
Feature: Containers
Problem: Trying to migrate a CT from one host to another will fail IF the CT has never been run on the node before.
Error Example.
2021-07-20 14:08:46...