nostr:npub1uud3g5xn0hd07tezkvsuq6dy2wj0a4vy4400w70xzfghryfmqxzs0q4kdc

...

I know that fedilab doesn't background-poll, though. It looks for some kind of push notification service provider, and if it doesn't see one, it'll just give you a warning and grab notifications when you have it open.