After tons of AppX and "Tile Data Model Server" service headaches, I've now found this in our Windows 10 (Enterprise) SysPrep logs:
ERROR: Failed DeleteInstance AntiSpywareProduct.instanceGuid{GUID}
We have paid support with Trend Micro so I opened a case with them. They just told me to add exceptions for C:\Windows\System32\SysPrep\SysPrep.exe
Not believing this was enough, I also closed Trend Micro before attempting to SysPrep...but it still failed. However, after I uninstalled Trend Micro, SysPrep succeeded....but this isn't an ideal solution.
Am I stuck without AV in our image or there any way around this?