Wi-Fi does not indicate?

So I have the problem that my Wi-Fi does not show on the laptop although it shows on other devices my Wi-Fi box is from Telekom

Hmm. Otherwise go with your laptop next to the router or call telekom

So if I connect the lan cable then it works but if I put it out no longer

Maybe the telecom router is set to 5 GHz Wi-Fi (ac standard) and your laptop only supports 2.4 GHz Wi-Fi (n standard). That's what you like to do when you have too many neighbors with a Wi-Fi router (at 2.4 GHz).

Check or google the technical data of your laptop. If the ac standard is not, that could be the reason.

In rare cases, more often with USA devices, the top 3 WLAN channels (12, 13, 14) are not supported at 2.4 GHz. The channels from 100 to 140 at 5 GHz do not support USA devices. Here it is explained (in the tables):

https://www.elektronik-kompendium.de/sites/net/1712061.htm

PS:

Have a look at the configuration page of the Telekom router:

http://192.168.0.1/ (you can set fixed channels in the expert view)

Good 36 GHz ac channels (without DFS) are channels 36, 40, 44 and 48.

Good 2.4 GHz (overlap-free) n channels are 1, 6 and 11 (do not select intermediate channels!)

Buddy of mine had this on his laptop even after a short circuit in the device that was repaired. Our Wi-Fi has accepted the device, but no longer - for whatever reason. He then helped himself by using a wlan stick…

There it says turn off I should turn it off

How? What? Turn off?

Check the router configuration page to see if 2.4 GHz Wi-Fi is enabled (turned on). Finished!

If only 5 GHz alone is activated (switched on), then switch to 2.4 GHz.

If there are two WLANs in the router (modern routers always have two WLANs) then only check whether 2.4 GHz WLAN is activated. Finished!

So don't switch anything off! Check it out!

Both are switched on

Ok, if it used to be, it is probably not the router.

Could also have been any Windows 10 updates that made the driver of the WLAN adapter messy.

Check in the device manager whether your wireless adapter is still listed.

You can determine whether your WLAN adapter has broken in Safe Mode. Here's how: https://support.microsoft.com/...-safe-mode

If it still doesn't work, I would download the original driver for the wireless adapter from the manufacturer's site (you can use it temporarily) and install it fresh.