What are the possible causes of error on user register/login?

Question:

What are the possible causes of error on user register/login?

Answer:

When trying to register or login, one of the following reasons is why they received this message:

• Entered password is not valid.
• User is group or domain restricted from the Enterprise/WebStorm.
• If the registration invitation expired.
• If the email does not exist.
• If an IP address has tried to login with the same email more then five times in the previous 15 minutes, they will receive an error code of "Login Failed"
• The user can then attempt to try and login in another 15 minutes with the correct password.