Tethering Nikon D90 doesn't work with neither Lightroom Classic CC and Lightroom CC 2015.13 on Mac OS High Sierra 10.13.1

I tried to tether my old Nikon D90 with the newest Lightroom Classic CC Version and also with Lighroom CC 2015 on 2 different computers, but neither computer nor any of the two programs recognised that there's a camera connected to the computer ("Keine Kamera erkannt")

I've worked through the https://helpx.adobe.com/ch_de/lightroom/kb/troubleshoot-tethered-capture-lightroom.html guide with no effect and didn't find any helpful answer in https://helpx.adobe.com/lightroom/kb/lightroom-and-mac-os-sierra.html

The Nikon D 90 is marked as a thetering camera in https://helpx.adobe.com/ch_de/lightroom/kb/tethered-camera-support.html

It's possible to import pictures from the connected camera, but not to use the tethering function... does anyone know a solution for that?

MacBook Air (13-inch, Mid 2012)

Mac OS X High Sierra 10.13.1

Lightroom CC 2015.13 (also tried with Lightroom Classic CC on a Macbook Pro Retina with TouchBar with Mac OS X High Sierra 10.13.1)

Nikon D90 with newest Firmware

Tethering works without problem using the trial version of Nikon's Camera Control Pro 2 or the Desktop Version of qDSLRdashboard...

Any help would be very much appreciated.

Greets, Roman