Is there a way to get human support?

I have tried to find a way to get support through the official means but the links just send me around in circles. Useless for such a big company such as Meta.

The issue I have is that my son is clueless about his email addresses and don't know how to use his Meta Quest 2 after a long break from using it. I have tried to enter the serial code but it says the product does not exist? Despite reading it clearly AND using the QR code to ensure it is right Meta won't recognize it. I want to get access to his account again but I don't know what email he used, but I can see what sort of [at]name he apparently has associated with the device.

And for anyone reading this: he has some somewhere learning difficulities. I thought he could manage his email address but I was wrong. Hoping to sort this out for him.