-X Post yields the same result as well, unfortunately.
Also, the documentation you linked says that data “Gets a list of users that subscribe to the specified broadcaster.” which is not what I want, but rather, simply a notification of when a channel gets a new subscriber with the notification type “channel.subscribe” which is similar to “channel.follow”. Could I not get that notification information with the broadcaster’s user access token (since it states " Must have channel:read:subscriptions scope."?) (Also, the app is an offline standalone application, with a place for the user/broadcaster to enter in credentials manually rather than going through the app extension page).