wireguard site 2 site not working

[austrian-firewaller]

I have two openSense firewalls both are Version 25.7.7.
I set up wireguard acording to the official documentation, without creating a interface for wireguard.
Wireguard it self, works fine - tunnel is established.

Topology is like that:
Site A: 192.168.1.0/24 - Tunnel IP 172.16.0.1
Site B: 192.168.10.0/24 - Tunnel IP 172.16.0.10

I have an allow -all- rule on the LAN and wg group firewall rule set.
I can ping from site B to the tunnel IP from the firewall on site A, and the other way around.

But I cannot, for christ sake ping any IP adress from one network to the other.. -> I see in the logs the the paket is allowed but ping for example never comes back.
But I can ping the tunneld network directly from the firewall itself.. So I also tried to disable outbound NAT for wireguard, still does not work. So I am clueless.

I would appriciate any help.

[Patrick M. Hausen]

What is the AllowedIP settings in the WireGuard peer on each side?

[Bob.Dig]

without creating a interface for wireguard

Create one on both sides.