Easily guessed character strings, such as keyboard sequences, cannot be registered as passwords.
Register a complex password that combines uppercase and lowercase alphanumeric characters.
For information on character strings that can be used for passwords and other conditions, refer to the following article.
What characters can be used for login-related information (Group ID, group display name, account name, password)?
https://help.teachme.jp/hc/en-us/articles/900005508446
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Related: What do the password strength indicators "Strong," "Intermediate," and "Weak" represent?
https://help.teachme.jp/hc/en-us/articles/4401857525785