Unfortunately, Sound, Icon and Badge do not work for me yet either.
PhilippBrosig
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Post
Replies
Boosts
Views
Activity
With an update, it is now at least possible to use the notification tag. Since the notification actions unfortunately still do not work, I send the link to which the Progressive Web App should direct via the notification tag. In the ServiceProvider I then use the tag to open the correct page. Works so far wonderfully. However, I am eagerly waiting for the actions to work. I hope this can help you a little further.