[DNSB]

I assume you have done all the usual steps such as restarting your Kobo, re-installing the firmware, etc.

You may also want to try Nirsoft's USBDeview to see if you have any odd USB devices such as ones with device name of unknown. Alternatively, you can open Device Manager and check for devices that are in an error state (yellow !) or are in the Unknown folder.

I did find that when I connect my Kobo Libra Colour to my Windows 11 computer and I get the first connection bing, a device with the VID 0525 and PID of A4A5 shows up but it never goes into connected mode. When I tap on Connect in the popup on the Libra Colour, a new device with VID 2237 and PID 4237 shows up and goes into a connected state. My Sage does much the same except the unconnected VID is 1D6B and the PID is 0106.

So at a wild-eyed guess, your Libra 2 is not registering the tap on Connect in the Computer Detected popup. If you are not seeing the Computer Detected popup, do you have AutoUsbGadget=True under [DeveloperSettings] in the Kobo eReader.conf file?