I discovered this when someone sent me an email message expressing confusion about my relationship to "Paul B. Callahan". Trust me, his confusion was dwarfed by mine, as I've never heard of Mr. (Dr.?) Callahan. The author of the email included a link to this page on MAS. Since the page is likely to change in the future, I'll embed a snapshot below.
So I tried searching MAS for "Paul A. Rubin" and ended up here. Again, I'll include a screen shot.
If you examine the list of publications on that second page, some are mine and some are very much not.
I searched the site for instructions on how to report errors. The answer is that you do not report them; you edit them out yourself. I have no idea if this means that anyone with an account can edit these pages (what could possibly go wrong with that?), or if the "owner" has to edit the page (in which case who owns the second one, me or my doppelganger at GMU?). In any event, I have no intention of creating an account with Microsoft just so that I can clean up their errors.
If I could edit the pages, I'd be tempted to change my photos into links to Google Scholar. So probably MS is just as happy that I'm not setting up an account.