Fix: Can’t Type Special Characters on Windows Login Screen
https://www.top-password.com/blog/fix-cant-type-special-characters-on-windows-login-screen/
Mar 05, 2018 . Method 1: Type Special Characters on Windows Login Screen. To insert the special character (such as #, &, @, {,}, [,],) shown on the upper part of a key, just hold down SHIFT and press the desired key to type it. If your desired characters (such as ©,®,∆,√) that are not on the keyboard, you can type it using Alt key codes:
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