In Chrome you can find it in the developer tools console, reading “Cannot read property ‘getAttribute’ of null”.
IE11 will give you a nasty script error popup with the same error.
We have a Winforms application in which we have implemented the universal login with your client package, following this guide: https://auth0.com/docs/quickstart/native/wpf-winforms/01-login
This uses IE11 under the hood so now all our users are confronted with this popup.
Can you please have a look?
Maybe you should include IE11 in your UI testing suite? Considering another IE11 bug 2 weeks ago: Universal login - Edge & IE11 - Placeholder stays on top when starting to type