I can assure you that remote desktop works over ipv6. I would check your firewall and make sure you have rdp access enabled
thats strange, i can not connect with rdp but ssh is working.
i'll try update the server and mayby then it will working.
i tested it from an windows pc in my internal network with ipv6 it works with that way.
But if anyone from outside the network connect to it it wont work.