Yeah I fixed it thanks to your Tweet url path giving me a clue on how to do it. I had my .well-known file outside my public_html root folder. Moved it in and boom.
Do I put the NIP-05 identifier field on my nostr client as gandalf@btcgandalf.com?
Discussion
Yeah.
I think you might need to do this as well: https://support.hostinger.com/en/articles/6320787-do-you-support-cors
Browser based clients might not be able to verify otherwise.