- You’re using Internet Explorer or Microsoft Edge to access Office Online Web App in the SharePoint Online environment.
- When you click the Skype button, you receive the following error message:We couldn't sign you in. Please try to sign in again or refresh the page.
When SharePoint Online creates an iframe to Skype for Business Online to enable integration, it must first authenticate. When it does this, it redirects to the OrgID URL in the iframe. Because an iframe inherits the zone of the parent, the page that's loaded in the iframe is also in the intranet zone. Internet Explorer stores cookies independently for each security zone. Therefore, the authentication cookie in the OrgID domain that's in the Internet zone can't be accessed by the iframe that's in the intranet zone. And because users can't enter their credentials to authenticate in a hidden iframe, authentication fails.
Article ID: 3109554 - Last Review: 30 Dec 2016 - Revision: 1