node delete cluster regain gui access

Hello, all I have a clustered PVE environment, consisting of two nodes, PVE1 and PVE2. PVE1 IP address is 192.168.1.2, and PVE2's is 192.168.1.9. Recently, I've upgraded PVE2, and now it has enough resources for all VMs, and I want to decomission PVE1 and turn it into a PBS. However, PVE1 is...