To denoise AOVs, you need to add variance AOVs:
Enable Output Denoising AOVs

You must use CPU for rendering.

Check enable Denoiser Beauty AOV and Output Denoising AOV's
Add a new output driver to the AOVs, and set the filter to variance


Tell noice to denoise the AOVs: enter the AOV names in the Light Group AOVs text box

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