Hello @Nuttytan
It sounds like your son's laptop may have "random hardware addresses" enabled. Take a look at this support page from Microsoft: https://support.microsoft.com/en-us/windows/how-to-use-random-hardware-addresses-in-windows-ac58de34...
Those explain how to enable it, but you should be able to follow them to check whether it's enabled and then disable it. However, if your son is intentionally using this feature to get around the network-level pausing, you may find that disabling this feature won't stop him from enabling it again. When I was getting my son through this period, I used operating system level tools from Apple (e.g., "Screen Time") and Microsoft ("Microsoft Family") to manage screen time instead of trying to use the network-level tools that, frankly, are becoming less effective as random MAC address and other features become more prevalent. So, you might consider looking into those features as well.
