Im having the same issue. The thread is marked "solved", how did you fix it?
tls_process_server_certificate: certificate verify failed (596)
January 18 08:26:16 n0 pveproxy [3867]: Could not verify remote node certificate '29: DF: 01: A8: 5C: 58: CB: FC: 97: 49: 57: 88: 7A: 00: 67: B9: 40: AD...