Hi MatthiasP_478,
Sorry for the delayed response.
Can you share to us the current OS version of your Surface device? Is it already updated to version 2004? You can check this information in Settings > System > About. Aside from that, would you be able to dock your Surface device and establish the ethernet connection through it? The USB-C port of the Surface device is for extending its display to an external monitor without the use of a dock. It's an audio/video output port. This could be the reason why it won't support direct ethernet connection.
Kind Regards,
Crest
No problem
It is updated to version 2004.
I did try something else, today I bought the surface usb-c ethernet adaptor (https://www.microsoft.com/nl-be/p/surface-usb-c-naar-ethernet-en-usb-adapter/8wt81cglrblp?activetab=pivot%3aoverviewtab ). And ........that just works fine!!!
Very strange, the ACT USB-c dock works fine on the ipad pro but not on the surface pro 7. Reïnstalling the drivers from the ACT device didn't changed anything. So the problem is/was the ACT USB-c thing doesn't work an a surface.
Thanks for all the help Crest_Z !!