Dear Bruce Wang,
thank you for contacting us.
Currently, we do not have such alert mechanism.
The only way to know the number of available and installed licenses is to connect to your account: https://atk.myscript.com/
after exchanging, internally, it seems you are facing difficulties accessing to your ATK account.
If using a generic email, you can reset the password via the MyScript SSO: https://sso.myscript.com/reset_password/request
The instructions will be provided to reset the password.