Can't connect to this network

Hi, the day before yesterday I bought a new WLAN stick here: https://www.amazon.de/...008IFXQFU/

I wanted to connect it to my WLAN and I get this error message every time (picture). The troubleshooting says the following (Fig. 2). I already googled after that I tried everything I found but it just doesn't work. The stick works normally on my laptop. You know what?

Is that really your W-LAN network that your stick is trying to connect to? Such SSIDs specified by the network operator can occur more than once, and then of course the Wi-Fi password does not match. It is best to change the SSID on your Wi-Fi router to something clearly individual

Yes, that can only be mine because it is the only WLAN that it receives.