Hello!
We're glad to know that you managed to solve the problem. Yes, for some reason their customer care could explain, Radmin interface blocks UDP connections. Eddie should not pick this interface for OpenVPN. For the readers: you can also tell Eddie to ignore any other interface by entering a valid name in Preferences > Networking > VPN interface name field (for example eddie) but, when Radmin runs, this solution could be insufficient.
Kind regards