So after solving the problem here : Monogame + Bloom
I started having problems with openGL as can be seen here: Monogame keeps crashing randomly!
and decided to create a directx project instead. I converted the fx to DirectX 11 and tried to run the game, it didn’t throw any error, but the bloom shader didn’t appear. The code hasn’t changed, and I did convert it to DirectX, I tried convert it in other ways, but it threw errors. I even downloaded this: https://github.com/demonixis/2MGFXGuiConverter and let it convert the file to directx for me, and the shader still didn’t appear. Why?