Our web app uses Auth0 as an authentication provider. Typically, this works great. Recently we're running into an issue where when the login flow is run through an iFrame (embedded in Shopify) we receive an error and the login fails. The weird part is that the flow works consistently in Firefox, but not in Chrome or Safari. Originally it wasn't working at all, but switching to classic login and changing settings for cross-origin authentication and clickjacking protection fixed the issue. These are the console errors we're receiving. The first is Safari (fails to login), then Firefox (success). Help!! Firefox 1 Firefox 2 Firefox 3 Safari Adding allowed origins, classic login, multiple browsers. Problem occurs only in browsers other than Firefox.