I found out today:

If you use your own domain as verification, it is not necessary to put a _ in "names". Just leave "names" empty, then the _ won't appear in front of the @ in some clients.

cc nostr:npub1xtscya34g58tk0z605fvr788k263gsu6cy9x0mhnm87echrgufzsevkk5s nostr:npub18jgxqshg38cgzcv43zvqhnc7hjn223psy2kkmkpqt2azd9thyy4sxjc5gt nostr:npub1l2vyh47mk2p0qlsku7hg0vn29faehy9hy34ygaclpn66ukqp3afqutajft nostr:npub1gcxzte5zlkncx26j68ez60fzkvtkm9e0vrwdcvsjakxf9mu9qewqlfnj5z