MT300N-V2, openvpn can not connect to lan


I am trying the use the mt300n-v2 as remote access device for a plc.

i have setup the openvpn server and it works fine.
But i can not connect to the plc on the lan port.
the plc is on ip

A bit more information would be appreciated and may be mandatory to find the issue.

For example Client, Subnet, redacted openVPN settings.