The error is because the client is asking for www.alohatube.com at the IP address handled by Caddy. Since Caddy only knows about pihole.xyz.xx it responds with a generic response that the alohatube.com domain is not known to Caddy, which is true. With that Caddy configuration the only time the /pihole/index.php would be served is if you had a client try to access pihole.xyz.xx/invalidpage.
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