how to config Wireguard for pve host?

I want to establish an vpn tunnel between two distant pve nodes (pve 1/ pve 2). pve 1 is on a vps. pve2 is behind a fritzbox.

First Attemp:

I installed Wireguard-server in a LXC-wireguard on pve 1 and pve 2
The connection between is LXC-wireguard-pve1 and LXC-wireguard-pve2 is established and from LXC-wireguard-pve1 I can ping all LXC of pve 2.
Problem:
But from the host pve1 or other LXC of pve1 there is no connection to pve 2 possible, yet. How can I configure that als LXC can join the...

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