Vipetla/vEdge - tunnel-interface command on all VPN numbers apart from VPN0

I'm new to SD-WAN and just playing around as I study - Using a home dedicated server with EVE-NG installed

If I assign an interface (eg ge0/0) to VPN0, it lets me use the tunnel interface command:

 vEdge20(config)# vpn 0 vEdge20(config-vpn-0)# interface g0/0 vEdge20(config-interface-g0/0)# ip address 20.20.20.20/24 vEdge20(config-interface-g0/0)# tunnel-interface vEdge20(config-tunnel-interface)# encapsulation ipsec vEdge20(config-tunnel-interface)# 

If I assign an interface to VPN10, it doesn't let me use the tunnel interface command:

 vEdge20(config)# vEdge20(config)# vpn 0 vEdge20(config-vpn-0)# no interface ge0/0 vEdge20(config-vpn-0)# exit vEdge20(config)# vpn 10 vEdge20(config-vpn-10)# interface ge0/0 vEdge20(config-interface-ge0/0)# ip address 20.20.20.20/24 vEdge20(config-interface-ge0/0)# tunnel-interface ---------------------------------^ syntax error: unknown command vEdge20(config-interface-ge0/0)# 

I have tried keeping ge0/0 on VPN and using ge0/1 for VPN 10 but have the same issue.

I have tried googling around and not found anything. Am I fundamentally missing something?