edit: actually looking at that screenshot, is your Camera using the Skybox setting? It kind of looks that way. It needs to be a Solid Color because the Skybox is unsupported for the 2D renderer
Thank you !
I found what I was missing thanks to you!
You were correct on the skybox but I also found this
Which makes all your materials to the supported version. Totally different from any tutorial I checked.
I also noticed that the new 2D render pipeline does not make your sprites go black. But If you add a global light I can see that it works by changing the values!