Replaced Gateway - now can’t find WiFi on some devices

In need of some help please.

Our Gateway went “out” last week and was replaced by an Xfinity tech.

I can get WiFi now on my iPhone, surface, and other devices - but not on my laptop. I can’t see the network and I can’t manually add it. Very odd.

Things I’ve tried- checking my drivers, restarting my gateway and laptop, searching for the WiFi address, etc.

I’m working from home this week so any quick replies would be greatly appreciated!