Help wanted! Driver up to date, everything checked, WLAN connection to the laptop still does not work, why?

Hope an IT professional can help me. Thanks in advance!

Briefly about my problem:

My laptop does not connect to the home network with the comment: "Can't connect to the network"

I went through all of the following internet help:

Restart router - problem persists
Restart laptop - problem persists
manual WLAN switch off and on again - problem persists
Connect LAN cable - problem solved (but wants to work in my office… Not in the living room)
Update the drivers of the network cards - drivers up-to-date, problem still there
Delete network profiles and create them again - problem still there
Reset IP - problem still there
Network troubleshooter - problem still there

So: laptop shows all available networks, but neither uses the home Wi-Fi nor the guest Wi-Fi. Then after "Connection is being established" it will show "Connection to the network can't be established"… Only uses the guest WLAN if I configure it without password protection.

Also takes the mobile phone hotspot, even with a password.

Router settings reconfigured, reset and even renamed WLAN, different PW, different security measures… Errors still there.

Can there be a problem with my laptop's Wi-Fi card?

Or what else can I do to fix the problem?

So… I also have that more often, often at the handy hotspot. Is your Wi-Fi limited to a maximum number of users? Then it comes. You could also use your cell phone as an extender, but that's just getting slow…

I would try it like this: attach with the cable, go through the settings of the router 20 times, if that doesn't work, turn off all devices that are connected to the Wi-Fi, try again.

The number of users is not limited. Other devices in the WLAN: only 1. The rest is connected to the network via LAN.