I think the Wireguard connection isn’t working. Could it be a firewall issue?
Is it possible to ping the wireguard IP (usually 10.5.4.1) of the NS8 from the NS7?
To check the wireguard services:
NS8:
systemctl status wg-quick@wg0.service -l
NS7:
systemctl status wg-quick@ns8.service -l
Check wireguard on both sides:
wg
The wireguard config files are in /etc/wireguard/*.conf