I'll have to edit this later, and host some files but I am researching an issue where after hotfix 2781272 (Which adds support for UEFI based client backups) my windows 10 PC will still not connect to the server. I saw this KB listed under windows update, and it is supposed to help fix the issue.
http://support.microsoft.com/kb/2934953Here is a link to the hotfix, along with another update that showed up in windows update after I installed the hotfix. I installed the hotfix, then restarted and checked for updates. I installed the update then went to each of my clients where client updates were available via the launchpad. I installed the client updates on each machine then rebooted. From here I was able to add and backup my UEFI/GPT Win 10 1803 machine. There seems to be another version of the hotfix available at the bottom of this thread as well:
https://www.tenforums.com/general-suppo ... 011-a.html