An Image Portability Service (IPS) prepare and publish job fails without any obvious error failure
The PoSH output has this message in it "Job failed at step WaitForPrepareImage with the error: A request made by the job has timed out."
When images are imported through IPS that are using an MBR hard disk the disk has to be converted to GPT in order to support UEFI. If the C drive in the image does not have at least 1 GB of free space it can take longer to convert the disk to GPT as the script first has to expand the disk to 1 GB on free space to allow the MBR to GPT conversion to take place.