Password Change - Use of Special Characters - Time Warner Internet

This question is about "Password Change - Use of Special Characters", with Time Warner Cable internet and apps. I just attempted to change the password for my email account. The instructions provided says the password may contain the following special characters (!@#$_-]*); however, I got an error message saying the password has to be alpha-numeric. Further attempts using the allowed special characters said the new password contained invalid characters.

Thank you.

Password Change - Use of Special Characters?