I ended up making the same hack I did a number of months ago, although it was supposed to be cleared up by now. So, in XBoxOnePlatform.Automation.cs I added the following lines:
The next patch release will have updated documentation, although you’ve already got it up and running.
Unreal 4.10 will have similar behaviour to 4.9, but I’ve been talking with Epic and I’m hopeful it can be resolved in 4.11 so plugins “just work” on all platforms.