A:AnswerAll serial numbers are different. That is why they are there so the product can be identified from others. Sorry it was stolen but without there serial number you probably going to just have to buy a new one.
A:AnswerIn my opinion, it's not very good with Zoom, Google Meet or any other meeting apps. No quick solution, in my opinion, other than to buy another laptop that can hold up to the task. I'm sorry.