@pajtaz 

Hi,

Can you please connect the Dell Latitude to the 3D scanner again and then look up the channel number within the "Properties" of the connection in Windows?
 

  @woozle Latitude says network band is 5 GHz (149).

Lenovo Tab Plus also says 5 GHz and Wifi 5.

  @pajtaz 

Then the Archer TX20U Plus you've got must be the "EU" version. (sold in countries of the European Union and many other countries that follow the EU's wireless regulations)

Many USB Wi-Fi adapters that TP-Link makes for the EU regulations do not support the channels 149 and higher.

If you indeed have the "EU" version (check on the serial number label), then I see two potential solutions.

1) find out if the 3D scanner allows the channel number of its hotspot to be changed to something between 36 and 140

2) if 1) is not possible, then replace the TX20U Plus with a Wi-Fi adapter that supports channel 149

  @woozle thanks for helping.

I am in EU, the adapter is EU. Now I understand why it can't see the scanner hotspot.

I am not sure if scanner hotspot channel can be changed by me. I have already created a support ticket with manufacturer.

Just wondering, how can old Samsung S9 see and connect to the scanner? It is also an EU device.

  @pajtaz 

There are already many posts about the issue in this forum. But I have not seen a detailed explanation from TP-Link as to what exactly prevents them from allowing channels 149 to 165 while still complying with the EU regulations.

I am not aware of such channel limitations on TP-Link's PCIe Wi-Fi cards.
 

  @woozle What about TXE70UH? Specs say it works in 160 MHz.

Actually, it is not clear to me at all what is the regulation. Can ANY wifi adapters in EU use channels above 140 MHz? It is not clear from documentation of adapters on the datasheets or websites. Basically what I am asking, can I buy ANY adapter in EU that will actually see anything above 140 MHz?

Does anyone know? This should be an easy statement to make but I cannot find a single web page to explain the regulation.

  @pajtaz 

The channel numbers do not represent frequencies. Channel 149 corresponds to a frequency of 5745 MHz.

I don't have any USB Wi-Fi adapters from other major brands that officially sell in Europe. So I have no idea whether they support those channels in the European versions of their products.

If you need to solve this urgently, then you may have to settle for a "no-name" brand USB Wi-Fi adapter.