Ok. Same device (mobile phone?), put it on airplane mode and enable WiFi.
This way we take the router out of the picture and we’re on the LAN.
Connect to the VPN service. Can you ping?
Okay, Yes still same device. So airplane on and WIFI enable a get connected to the VPN Server I see my device with the assigned IP, but when I ping 192.168.5.1 it is lost again no connection