My application is using passwordless login, and everything was ok, but today y started to get this error: GET https://.../user/ssodata 404 There was an error fetching the SSO data. This could simply mean that there was a problem with the network. But, if a "Origin" error has been logged before this warning, please add "https://....auth0.com" to the "Allowed Web Origins" list in the Auth0 dashboard: https://manage.auth0.com/#/applications/.../settings
And after that the application stops. This is something that at least a few days ago was not happening.
When does this error occur? When Auth0 redirects back to the app after the user has entered the code?
Can you try with an incognito browser, or clear all cookies.
Are there any other JS errors in the dev console?
Maybe you can take one of the Quickstart projects from your application quickstart tab (Auth0 Dashboard), run it locally, see if that works (with the same clientID). This way you know whether it’s an issue with the Auth0 application configuration (in the Dashboard > Application Settings) or the way it’s called from your client application.
I’ve seen this error message before in the forum. Maybe some of these are helpful: