I'm not sure if what I have to add will be helpful. But, here goes. I have a MacBook Air I bought in 2017. I use an external apple cd/dvd drive connected to one of the USB ports on the MacBook and all was fine until I upgraded the OS to Monterey v12.1 today. While installing Monterey, a pop up advised that the dvd/cd drive I'd always used would not work. I continued regardless (probably an unwise decision, on reflection). So, once installed, I plugged the external cd/dvd drive into the usb and, indeed, with the new Monterey 12.1 OS installed, Finder could not detect the external drive and having done all the checks and balances, still no luck. So, then, I decided to leave the cd/dvd drive connected by USB and just put a dvd into it and see what happened ..... and lo and behold, the dvd instantly opened and began to play the dvd regardless of Monterey OS 12.1 not identifying that the external drive even existed. I do not understand this at all but am glad that the external drive plays dvd's and cd's regardless. Good luck and I hope you find a solution to your current issue.