Post processing is not working

Package Manager
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1

I don’t understand why post processing is not working, I follow all the tuto and documentation and don’t find my error.
I use URP as pipeline renderer.

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I add a post process Layer on camera and set the layer to everything to be sure it works before creating a dedicated layer :
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And add a post process volume to a empty gameObject in the scene wich is Global :
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What I miss ?

2

And sorry I forgot to mention that I check the checkbox PostProcessing on camera in rendering section

3

Using a volume instead of a post process volume works …

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Dont understand why…