We're sorry, but your password couldn't be changed. Code: 0x8007052d
What does this mean? It took me a bit of experimentation, but I figured it out. Windows Ten has, believe it or not, a maximum password length. (That's not a typo. I don't mean a minimum. That would actually make sense.) It has two maximum password lengths, actually.
The above error message is what you get if you exceed the longer length limit of 63, when changing the password at some point after the account is set up or, at any rate, after the computer is set up. (I haven't tested what the rules are for additional accounts you create later.)
So what's the shorter limit? 20. When you turn on your computer for the first time and create an account and enter a password, you must enter a password that is 20 characters or shorter. There's nothing on the account creation screen to indicate this, and no warning if you exceed it. Everything seems to go fine, in fact, until you later try to log in, at which point you can't. (This can, of course, be solved in the usual ways. So much fun.)
Now if you'll excuse me, I have an urgent need to go install a real operating system. Immediately.