It's mentioned, not to connect your Kemper to Mac/PC using USB hub.
I have it connected like this since few months and it works flawlessly.
Have you ever encountered this plug/unplug USB annoying notification, when having multiple USB devices connected to you USB HUB?
It's because you're using passive USB hub. It cannot deliver enough current to devices connected.
Since I bought https://www.tp-link.com/en/hom…computer-accessory/uh720/ active USB hub, I have my Kemper, Arturia Keylab49 Midi keyboard, USB keyboard/mouse combo and whatnot connected and it all works.