Are you trying to listen in Dolby surround on a stereo setup? Disney+ defaults to surround sound and you’ll lose some audio channels if your speakers are stereo

Channel issues are like 90% of issues like this, but it's not always user error. Often a cheap production will just ship the front left + right channels as the stereo mix, instead of down mixing all the left + center channels into the stereo left etc. This is endemic in back catalogs on streaming providers where the catalog is a bulk assets that nobody reviews and is passed around between companies that don't care about the quality they deliver to each other.

That seems like a terrible default, aren't most people listening in stereo at best?