I want to set two VPN tunnels on two different devices but only one has an internet connection.

Device 1 is a Wi-Fi access point.
The Red VPN connexion works fine but I can not establish the 2nd VPN connection.
When the Device 1 is connected to the VPN I can't even ping the VPN Server from Device 2 but when the VPN is off on Device 1, I can ping the server from Device 2.
I assume that it's a matter of openvpn configuration but I haven't find the good one..
How can I fix it?
Thank you
