in order to help you find out it working or not let do post scant first just type into search PortQryUI - User Interface and download it from Microsoft website
after that run the unity to scan the port . i down load the openvpn OpenVPN configuration files as example so you can see port open before you can connect to it.
open the config and copy its address to scant just choose UDP
and here you will see the result.
it said LISTENING .
Just add your public ip address and do the same , if you can see the same so it should work , if you cant see the port open it will never work for you .
online scant only do on tcp port so it show maybe not correct but you use udp . using port unity from Microsoft will show you what you want to find out can work or not .
he said that "Unless you set it up really badly." so all openvpn sevice provider setup openvpn very bad and port still can scan so only him can setup close openvpn port . it is up to you to find out yourself who is help you and who is mess up to make you confuse