Thereare two possible causes.
Pattern 1: Your registration hasn't been completed.
To complete your registration, please click the URL in the body of the email with the following subject sent by the inviter, and create a password.
＝＝＝＝＝
Title： [ILS] Invitation to ILS（ILS参加登録メールアドレスの認証のお願い）
＝＝＝＝＝
*If you haven't received an invitation email, please check "How can I get the invitation email?".
Pattern 2: Emails have been sent to your junk folder, or your system is blocking emails from ILS.
Firstly, please check your junk folder. If you still can't find the email, your company's security system may be blocking emails from ILS.
The domain of the notification email from ILS is "@project-nippon.jp"