I had this very same issue (With SCCM CB), have you tried importing the wim from the ADK?
If that doesn't work, then find the WIM for the ADK and make a copy of it. I forget where it was installed, but for the heck of it I went to the drive the ADK was installed and did an attrib /S /D *.wim and found it.
After copying it move it to a location seen from the UNC path of the SCCM server and find a directory of your choosing, I dropped mine either in OSD or some other location.
Then try importing that. If it doesn't import then give this guide the following try.
https://blogs.technet.microsoft.com/brandonlinton/2015/07/30/windows-10-adk-boot-image-updates-for-configuration-manager/
Hope that helps!
If this gets you going, feel free to mark as answer. :) Or at least helpful, if it gets you going in the right direction.