I got this error when trying to send a request to a remote instance:
Client error: `GET https://indieweb.social/users/elgg` resulted in a `401 Unauthorized` response:
{"error":"Webfinger response for demo.wzm.me@demo.wzm.me does not loop back to https://demo.wzm.me/activitypub/application}
Where demo.wzm.me@demo.wzm.me is alias for Application type of my server.