Short URL redirect (/{shortcode}) returns 404 after Azure deployment

I deployed the AzUrlShortener (version 4) repo to Azure using az up, and while the API endpoints work fine for creating short URLs, the redirect route (/{shortcode}) fails. When I hit a generated short URL on the deployed app, instead of resolving to the original long URL, it consistently returns 404 Not Found. Please guide how to get it fixed. (ingress is enabled in portal)