Same issue here. I found following on Amazon today (19 august 2023):
Lenovo 2022 Legion 5 15.6" 120Hz Gaming Laptop, AMD Ryzen 5 5600H, 64GB RAM, 2TB PCIe SSD, NVIDIA GeForce RTX 3050Ti, Backlit Keyboard, Phantom Blue, Windows 11, 32GB SnowBell USB Card
Such a machine should not be able to exist if AMD states it is not able to have only 32GB.
Either AMD's marketing department should fire some people, or something very strange is going on...
The thing is that I upgraded a 5600h laptop from 16GB to 32GB. This whilst I want to upgrade to the maximum possible. So IF 64GB is possible, I feel pretty screwed!
Can AMD not respond here? Like said, this is a terrible (an unacceptable) job done my AMD marketing in my opinion...
See Also
AMD Ryzen 5 5600 review