Add recovery options to your administrator account
If you were granted administrator privileges to your Google enterprise account by another administrator, be sure to add a recovery phone number and email address to your account. That way, if you forget the password to your account, you can click the Need help? link on the sign-in page and we'll send you a new password via your choice of phone, text, or email. Until we have your recovery information, we won't be able to reset your administrator password via phone or email.
If you're the administrator who signed up for your Google enterprise account, you already supplied recovery information when you signed up so you don't have to add it as described here.
To add recovery information to your account:
Note: Phone and email methods for resetting the administrator password aren't available for accounts with more than 3 super administrators or 500 users. If your account exceeds these limits, see these other ways to reset passwords.