I have a child server that is a completely different domain. When I request a LetsEncrypt cert I get the following error
redacted.com challenge did not pass: Invalid response from http://redacted.com/.well-known/acme-challenge/DLeSm5WKQ_eqhVZVHMrx6c2AS3ddIKsb0p3-67H_5QE [188.8.131.52]: "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n<html><head>\n<title>404 Not Found</title>\n</head><body>\n<h1>Not Found</h1>\n<p"
and the .well-known directory is not in the /home/parentserver/domains/redacted.com/public_html/
I am not sure if this is a known issue but its not working for me.