The Disney+ app is also available to download on your Xbox One and Xbox Series X|S console so you can start streaming immediately.
Moreover, how do I connect my phone to Disney Plus on my Xbox?
Go to the ‘Apps‘ section of the store. Under ‘Search Apps’, type in Disney or Disney Plus. You should get automated results. Select the Disney Plus tile that appears and then select ‘Get’.
One easy solution to fix the Disney plus not working is to log out from Xbox account and then login back. Try opening the Disney plus app now, hopefully it will work.