I just set up my NIP-05 verification (https://mattlorentz.com/.well-known/nostr.json) using an underscore for the name described in the spec. It doesn't appear to be working in Damus or Iris. I think I have it correct, because I checked #[0]'s profile where he does the same thing and he also doesn't get a verified checkmark. Happy to open GitHub tickets if you'd like #[1] #[2].