Custom post types pages going to a 404 page
If you are trying to display the actual pages of Snippets, Testimonials, Showcases (or any future custom post types built in to Architect) and you are getting the 40 page, try resaving the permalinks.
This document can be viewed online at: https://architect4wp.com/codex/custom-post-types-pages-going-to-a-404-page/
Resave permalinks