How to listen for "Sign Up" failture?

According to the documentation:

There is an event listener for “authorization_error”. However, this only seems to fire if there is a “Log In” failure, but I can’t seem to find the listener for “Sign Up” failure (I can listen for “signup submit”, but that doesn’t seem to provide any detail on if the sign up succeeded or failure).

How do I listen for a “sign up failure”?

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