MediaPortal PVR addon not working on 17.3

I have Kodi 16.1 , and Mediaportal 1.15 as the PVR backend, and its running properly. I’m running Windows 10. When I installed Kodi 17.3, I installed it to a separate directory. When I launched 17.3 my setting were imported, but I had to reselect my PVR addon. However, when I choose the MediaPortal addon in 17.3 , it says it cannot connected to backend.

I can switch back to 16.1, and I have to enable the TV addons generally again, but it can connect to the MediaPortal backend and works normally.

Any suggestion how to get this working in 17.3?

Thanks