Hi Rob,
It sounds like you're having trouble installing the Phi Silica AI Component Update (KB5067465) on your Surface Laptop 7 (X Elite chip) and Surface Pro 12 (X Plus chip). Seeing that error code 0x80070057 over and over must be annoying, especially since you've already tried a bunch of fixes and even talked to Microsoft.
Usually, that error means something's up with the Windows Update, some files are corrupt, or there's a settings problem that's stopping the update. Since you have Copilot+ PCs and this has to do with AI parts, I think the problem is how these updates are being put out or checked on these new ARM systems.
Please Follow these steps.
Try Windows Update Troubleshooter, and check if your system files are okay with DISM and SFC scans. Try also downloading the update straight from the Microsoft Update Catalog or starting your computer in clean boot mode to see if something's interfering.
May I also ask have you already tried fixing the update or installing the update yourself? Also, do you have enough space on both devices, and are there any network drives that could be messing things up?
Let me know if you've tried any of this or if you have more info. I'm happy to help you figure this out.
Best Regards,
Noel