The host (WP Engine) claims they are unable to change file permissions (the wpbeginner site suggests changing permissions on the HTACCESS file to 666, resetting permalinks, then setting the permissions back). I’m unsure as to whether that suggestion was important, being that the contents of the HTACCESS file are exactly as specified in the wpbeginner suggestion already.
At any rate, the solution (resetting the permalinks) did not work. This technique was already applied prior to initiating this topic, so it was basically telling me to try something I already tried.
I’m going to try just re-creating the product, and we’ll see if the URL works at that point.
It is not yet resolved. Updating the permalinks did not help, though I haven’t had the host perform the permissions thing with the htaccess file yet.