I tried to perform the new AI noise reduction that came with the least LR classic update but the process is alsways termiated with an unknown error message. I'm using a 2018 Mac Mini with the 6 core i7 processor and osx 13.2.1.
The 2018 Mac mini uses an integrated GPU (Intel UHD Graphics 630) which has got access to around 1.5GB of shared system memory. The system requirements for LrC 12.x are linked to below. Note the minium GPU memory is 2GB. I suspect this is the reason Denoise doesn't work on your system.
I just wondered that the function is even possible to select as some of the AI masking tools are not availble and grayed out due to a lack of graphics memory. So I supposed it should work as it is available.