200 responses on localhost, 404 responses on Netlify

I have deployed my React/Express site successfully

Yet I’m get 404 responses where I’m providing a path in the URL as instructed on the root page…/:date. I checked DevTools and the console confirms this, but nothing shows as Network activity? I’ve made identical requests by providing that path on localhost which return responses with 200.

Back to Netlify, if one of the links on the root page is clicked it returns a 200 response and shows the timestamp data. I get the same response with localhost. I’m assuming the problem is associated with Netlify somehow, but I’m unclear what the cause would be and how to remedy it?

You’ll want to reference #2 in this support guide re: adding a SPA redirect rule: