There’s no option in app settings or in phone notification settings, hence I’m not receiving anything about replies/upvotes/subscriptions. I can see notifications only in app but there’s no sound reminder of it so I need to check app for notifications every hour.
As others have said, there is no push notification support from Voyager or Lemmy. But you can subscribe to an RSS feed of your inbox and use some RSS reader to get notifications about new messages.