If you upgraded your Mac with newer hardware (CPU, GPU, AirCard, etc.) you have to make your OpenCore Legacy Patcher Installer on the machine you want to install Monterey/Big Sur. The changed hardware needs to be detected I think. I created the 12.0.1 installer on a 2012 MacBook Pro and installed on a 2007 iMac. The iMac would not work. Previously, I made the installer on the 2007 iMac and it did work.