Custom Teams app works in desktop app but not in browser app

I've created a simple app using App Studio. It's basically 1 tab that display organization website.

I installed the app successfully, but when I access the app in Teams in the browsers, It loads the content URL which is fine. but internal routings were not working. When I access the same app thru Teams in the Desktop, it displays tab/site correctly with proper route navigation.

Has anyone seen this or know of a way to fix the issue?