that id is an id for a specific album, not for the artist (which you need to find somehow)
i do know, that searching for the artist in the widget also returns this id , but what you need to find is an (artists) id that has those three releases
be aware though, that these do not always exist. either because they were not set up that way by the user /artist or apple screwed it up – which is not as uncommon as one would expect.
i mean i have seen cases were itunes uses the same id for 2 different artists that just happend to share the same name….no, dunno either how they managed to do that
either way, not much i can do really….at the end of the day, itunes returns what it returns when you send it a query. i have no control over what exactly is included in the results they send back and can only filter those results in some way shape or form
the query for your id results exactly in one item, hence the widget can only display this one
https://itunes.apple.com/lookup?id=891913386