Yes, OneDrive isn't really relevant to what I was trying to do. I only noticed that when I did a practice run on the desktop, apparently that sync to OneDrive was in play. Normally none of the relevant folders interconnects with OneDrive at all.

I only mentioned it because that was where I got the error and I presume the reason was, the desktop was syncing to OneDrive. I'll have to test it out again using only local drives and see if it works. It's basically going from one shared drive (but not cloud) folder to another.