News Flash: Spaces are legal characters in both filenames and passwords!
My comments to that posting:
I didn't know spaces were valid in a Windows password until I happened to be watching a Microsoft video a year or three ago. Oh I knew all about file names having spaces but not Windows passwords.
I'm a database developer specializing in MS Access for the last ten or fourteen years. I've been using Windows at least that long.
Many, many users don't know that either. I've asked around. I'd suggest adding some text to the Windows login screen.