OK, back again with the same problem. I decided to put my Surface Pro 3 back to factory conditions. And during the procedure, I had a choice of several PCs to use as the source of setup information. (Also the choice to install as a new PC.) And once again, all but one PC was old and no longer in my possession. The Surface Pro 3 was the only PC in the list that I currently have. My other PC, a UX303LA, was not in the list.
So, once again, how do I get the list of PCs in my Microsoft account corrected?
Thanks for any help.