It was after I removed the previous Windows version is when I had issues. I could take an image after upgrading to 1709 but when I went to clean out the previous windows version the next attempt to take an image would fail. I would say this happened about 4-5 times with different PCs (same model) before I pin pointed what step caused the image to fail.
Steps for me were like this.
- Win10 machine with 1703 - Image Success
- Upgrade to 1709 - Image Success
- Remove old patch data - Image Success
- Remove previous Windows version - Image failed
I removed the patch data and previous Windows install via Disk cleanup > Cleanup system files.