Auth0 Lock signup error with "WE'RE SORRY, SOMETHING WENT WRONG WHEN ATTEMPTING TO SIGN UP."

[oonisim]

With the original CDN import, the signup fails although user is created, as reported in There was an error processing the login #546.

  <script src="https://cdn.auth0.com/js/lock-9.min.js"></script>

With the current latest 11.8.1 does not work either.

  <script src="https://cdn.auth0.com/js/lock/11.8.1/lock.min.js"></script>

Auth0 sample jQuery Quick Start does work.

I suppose the javascript implementation is outdated and does not work anymore.