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.