In ConfigMgr 1602, I was using Offline Servicing to schedule some updates in my Windows 10 wim. It failed. Taking a look in OfflineServicingMgr.log I found:
WIM::MountWIMImage returned code 0x80070005
Image Mount failed with error 5
Schedule processing failed
Error code 0x80070005 is also known as “ACCESS DENIED.”
I resolved this by removing the Read Only attribute from the .wim file I was using. It was originally like this when I copied it from the ISO.