Authenticate User from other Application

Hi All,

 I have a web application and I am creating a mobile version of it using Telerik Platform. I am facing problems in Authenticating Users. I have a login screen and when user clicks on login, I hit a U​RL of my Web Application but everytime it gives me success: false. When I hit the same URL from a new tab, it authenticates the user. What I am missing? How can I make users ​logged in from Telerik Platform?