Group ID, Group Display Name, Account name, and Password have the following character restrictions.
●Group ID
[Available character types] Digits 0–9, uppercase letters A–Z, lowercase letters a–z, symbols "._-"
[Length] 1 to 40 characters
[Other] A Group ID that is already in use cannot be used
Blank spaces cannot be used
Depending on when your contract was signed, hiragana, katakana, or kanji may have been used
●Group Display Name
[Available character types] Digits 0–9, uppercase letters A–Z, lowercase letters a–z, kanji, hiragana, katakana, symbols
[Length] 1 to 50 characters
[Other] The following can be used in half-width or full-width:
Alphanumeric characters, katakana, symbols
●Account name
[Available character types] Digits 0–9, uppercase letters A–Z, lowercase letters a–z, symbols "._-"
[Length] 1 to 50 characters
●Password
[Available character types] Digits 0–9, uppercase letters A–Z, lowercase letters a–z, symbols
[Length] 8 to 64 characters
[Other] Must not be identical to the Account name; password strength must be "Medium" or higher
▼Please tell me which symbols can be registered as a Password in Settings Center
https://help.series.teachme.jp/hc/en-us/articles/63111848698777