it looks like the server is case sensitive in this case, it won't return output when queried for Chris: 

$ curl -v 'https://minestr.app/.well-known/nostr.json?name=Chris'
< HTTP/2 404
$ curl -v 'https://minestr.app/.well-known/nostr.json?name=chris'
< HTTP/2 200
{
  "names": {
    "chris": "..."
  }
}