I just realized my Let’s Encrypt certificate might be causing this problem, since thew .well-known contains?s the following .htaccess file:
# Permit access to the challenge files but nothing else
Order allow,deny
Allow from all
RewriteCond %{REQUEST_URI} ^/[.]well-known/acme-challenge/[a-zA-Z0-9_-]+$
RewriteRule .* – [L]
RewriteRule .* – [F]
Could this be the culprit? If so, how could it be fixed without breaking anything?