ok, I’ll give that a try. I did have success (temporarily modifying the plugin code to not check is_reachable that was returning true on staging and false on production WPengine).
It was connecting and indexing. But I am getting search errors in the plugin log.
Index wp_searchable_posts does not exist
When I look in my Algolia dashboard I see wp_searchable_posts_tmp so it does look like wp_searchable_posts is not available in my indices.
Also what is searchable_posts vs posts in the plugin settings? Seems like searchable is a smaller subset of posts. Can I index just posts?
Thanks again for your assistance.