Your @auth0/cordova
npm package is no longer registered and cannot be installed using npm.
This was working as of a week ago.
npm install @auth0/cordova
fails.
https://registry.npmjs.org/auth0/cordova/0.2.0 - 404
npm ERR! 404 'auth0' is not in the npm registry.
npm ERR! 404 You should bug the author to publish it