sasho on Nostr: Having troubles verifying NIP 05. I’m getting “Failed to verify NIP05 identifier ...

Having troubles verifying NIP 05. I’m getting “Failed to verify NIP05 identifier on server.”
Any tips? I have added nostr.json in my domain.com/.well-known/ directory.
I also added add_header 'Access-Control-Allow-Origin' '*'; as it seems that it is required for Nginx.
What else? :)