What could cause the Wi-Fi access point to be invisible to one computer, but visible to others?

A client of mine has a Windows 10 laptop that cannot see her router’s access point.

The access point is visible and works fine for all other devices in the home. The laptop can see and connect to any other access point when she travels, and also connects to my mobile hotspot without issue.

**What I have tried:**

* Placing the laptop right next to the router
* Disabling antivirus software and Windows Firewall
* Full network reset on the laptop
* Factory reset of the modem/router
* Using an external Wi-Fi dongle on the laptop
* Verify the WiFi *range* of the laptop (I was able to see my car's cloud cameras from way out on the street)

I have run out of things to test. A new access point would work, but I’m baffled as to what is the exact cause.

**Edit:** This issue isn't similar to [Laptop can only see a couple of networks](https://superuser.com/questions/1070130/laptop-can-only-see-a-couple-of-networks) because in this case, the laptop does connect to other access points from the same region (AU). And the router has both 2.4GHz and 5GHz bands, but the laptop sees neither. All of the suggested points in the accepted answer have already been ruled out by *What I have tried* above.