I think you're correct now, but I believe this changed relatively recently (maybe around a year or so?) In fact, in some Microsoft Account password setting pa

I think you're correct now, but I believe this changed relatively recently (maybe around a year or so?) In fact, in some Microsoft Account password setting pages, there are warnings that say setting the password longer than 16 can cause XBox logins to fail (I think this is in Windows 10 for example). All of this is anecdote from personal experience so take it with a grain of salt. I haven't researched it.