Amazon Instant Video app
I recently subscribed to Amazon Prime here in the UK. Having seen it now includes access to free video content of over 15000 TV series and movies I downloaded the Amazon Instant Video app. I can report that it is fully accessible to Voice Over and it is very easy to discover and play content. Sadly, none of it is audio described but, hey, I suppose it's a start! Some of the older stuff like Startrek and Life on Mars I've seen so often I could act it out myself anyway!
I've had Prime for years and Instant Videos since it was introduced. Also I use Amazon Music.
Funny how Amazon can get it so right on IOS but often so wrong on Windows. Amazon Music is terrible on Windows but I love the iPhone app.