Sometimes it means the page checking the password is following a different ruleset eg. the main page is case sensitive and the change password page isn’t. Sometimes it’s stuff like the entered password is silently truncated to a fixed number of characters and because of that won’t let you log in. Sometimes it’s wierd character expansions being passed directly to the password checking routine (& or similar).
My favorite, though, is:
types in password “Password incorrect” goes to reset password “please enter a new password” types in password “your new password cannot be the same”
That just means you entered it wrong the first time.
Sometimes it means the page checking the password is following a different ruleset eg. the main page is case sensitive and the change password page isn’t. Sometimes it’s stuff like the entered password is silently truncated to a fixed number of characters and because of that won’t let you log in. Sometimes it’s wierd character expansions being passed directly to the password checking routine (& or similar).