This problem only happens when you try to access a VM Spice console from a different server than the one hosting the VM.
Client = the proxmox server you're using to access the web management interface (eg : proxmox1.local)
Server = the proxmox server where your VM is living (eg ...
After fighting against this problem too, you also need to change the config on the client side (the server from where you are requesting the VNC console) :
For the client (/etc/ssh/ssh_config)
SendEnv LC_PVE_TICKET
For the server (/etc/ssh/sshd_config)
AcceptEnv LC_PVE_TICKET
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