Hi aircraftnut -
Currently our mobile app only supports sign in with the primary email address associated with the Xfinity Home security account. If you are concerned with providing those credentials to another user, we can open a ticket to set up another email address used only for Xfinity Home that you can share with another user.
Hi LeandroSantos -
I pulled up your account & am seeing successful activity in the app post the 43401 error. If you experience this again, please reach out.