WP is ignoring .htaccess rewritten URL

RewriteCond %{HTTP_HOST} dom1 [NC]
RewriteRule ^((about\-us|etc).*) /dom1/$1 [NC,QSA,L]

Your rewrite rule includes the L parameter, which makes it stop processing rewrites. So WordPress’s rules to redirect to index.php likely never come into effect. Which means WordPress is not even being run here. The 404 is likely from the webserver saying that the file at /dom1/about-us does not exist.

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