I can't open Blueprints in C++ despite generating C++ source files for the project

I’m a beginner in C++ who wants to open blueprint native code in my project.

I already have VS 2019 installed with the necessary modules, I’ve generated the C++ source files for my blueprint project, basically followed all steps in this tutorial How to Convert a Blueprint Only Project to a C++ Project (using Windows).

Yet when I double click on any blueprint, it’ll say “reading C++ symbols”, the notification will fade, then nothing happens.

Appreciate any pointers!