Hi aida1 --
I pulled up your account & would like to confirm the username you are using to sign in. I will private message you with more information. Private messages can be accessed by clicking on the envelope icon in the upper right hand corner of any forums page.
I'm also having the same problem with the Xfinity Home App on the iPhone, the iPad, and my Nexus Android Tablet. It was working earlier today so I wonder if the mobile servers went down?