@apps
I currently use the ntfy app. Beside ntfy.sh topics from apps I added a selfhosted ntfy instance.

Sunup seems not to support adding url's from multiple servers manually. Thus the ntfy app makes more sense for me. But since I can't see the Fedilab topic for https://push.services.mozilla.com in Sunup, I can't add it in ntfy instead. At least I think I could do so since ntfy uses UnifiedPush.

Could you maybe just add the full topic/link to Mozilla's push channel?