To fix Disney Plus Error Code 24 first check the internet connection as Disney Plus Error Code 24 most often indicates that there is a problem with your network connection to the internet.
Ensure that the device is connected properly and you may need to restart your modem or router if needed.
When I had the Disney Plus Error Code 24 it turned out to be a poor internet connection and restarting my modem and router fixed it.
However if that doesn't work for you it could be just an unstable internet connection that will resolve itself or could be another issue.