Joining Cluster pve-ssl.pem error

Good days everyone.

I have a question that I tried many times and search over the Internet and got no answer. Well, I have 2 Proxmox machines fresh install. But when I join the cluster it had the pve-ssl.pem not exist error. No matter how I tried it doesn't work, so I try to make each machine join existing cluster which also runs Proxmox 8. It doesn't work too....

I am exhausted from all solutions, can anyone shed some light on me?

Thanks