Failed authorization procedure - 404 Not Found

when I run

certbot-auto  certonly --manual

I get error

FailedChallenges: Failed authorization procedure. (http-01): urn:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from "<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<title>404 Not Found</title>
<h1>Not Found</h1>

The link is working from any browser…

I just fixed it, IPv6 …

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