title: Adding Users from one Azure Active Directory to access an application in another Azure Active Directory
body: <p>I have two Azure Active Directories - AAD1 &amp; AAD2 - both under same account. I have added a web application to AAD2, so that anyone accessing that web application will be redirected to a single sign-on page. A user from AAD2 - aad2user@aad2.onmicrosoft.com is able to login using his credentials to the web application. I now want a user from AAD1 to access the same web application. So, I added that user to AAD2 (as a global administrator). The azure portal active directory page now shows me the list of users for AAD2 which includes the latest user (AAD1) I have added. Despite, this when I try and login using the credentials of the AAD1 user I encounter an error saying - "The account xxx@aad1 is not configured to sign-in to this company". Do I need to do anything else in-order to allow access from one Azure AD to another Azure AD application?</p>