Disney Plus App

I recently signed up the bundle for Disney Plus bundle with HULU.  I am trying to log in to the Disney Plus app on my second smart tv.  

BTW, I am able to get the HULU App to work, it is just the Disney App that will not work on my TV.

I am getting a message saying I need a new box? 

Also that I can have new box just sent to me, is that true. Does the box come from Xfinity? 

Do I have to pay extra per month for this new box?  We have three boxes in our home, two are able to use as the DVR . 

The box where the Disney app is not working is a smaller box , maybe not as new as the main TV box and the Disney App is working on the main TV? 

I would like to know how to get the Disney App on my TV to work where I can login.