Hi,
I would like to point out that after making any changes I suggested and the problem still persists, that change must then be undone or restored, it seems quite intuitive to me. Then you can re-enable Bluetooth.
Have you tried to temporarily set up your wi-fi network in the Open network, as I have already suggested, and check if it works? You have not provided any response on the matter.
In the Advanced Settings of the wi-fi adapter, set the bandwidth to 20 MHz only. Try again.
In Wireless Mode, please try to set to IEEE 802.11b / g Retry. All other options are irrelevant.
Your partner's laptops work because her wi-fi adapters adopt the recent 802.11AC wi-fi standard.
You can see the other wi-fi networks in the area because surely these networks do not use the Wi-Fi 6 802.11AX standard or these networks use routers different from yours. In any case, if there is an incompatibility between your wi-fi adapter and your router, you can't even detect the wi-fi network.