Hello! G-Portal does not currently offer dedicated servers for Xbox at this time. I'm sorry for the inconvenience!
Hi irwinan, so far what I find on this question is: NO. Not sure of all the mechanics, but it's not just g-portal, from what I found the option isn't available at all.
daenrys is correct there.
Conan is not cross platformed..yet. From what I gather, Funcom was looking into the options for PC vs consoles, but I don't think anything is coming of that at this time.
You basically control server operations from the PC side but the actual gameplay itself is going to be dedicated to ONLY being PC, XBOX, or PS4 on an individual basis. There has been a lot of chatter and speculation on Conan going cross-plat, but nothing for certain at this time from Funcom on that.
Awesome question though irwinan!