I just tried, and it works. But since his wallet did not return an address for verification, I cannot accurately determine whether it was successful for now.
Hum, I tried to zap nostr:npub1w98zr2sevkqle6lmt7u503ewclhzs2cdq94ke4mw7kmpxy2u9y5s6fe9yy and still doesn't work.
Discussion
Strange, I'm on Version: v0.1.0 (5ad4dfa) and doesn't work
His profile doesn't even have a lightning icon

Now I see sorry. And I was able to zap. Thanks.
This issue might be that his metadata you retrieved yesterday was an older version without the Lightning address. Jumble caches data for a day, hahaha
Maybe lightning address shouldn't be cached, because it's an important data?
It is stored in the kind 0 event along with the avatar and username. Caching it for a day shouldn't have too much of an impact.
We can test it for a while to see if it's necessary to query the latest lightning address before zapping