ADUM3160 USB isolator

In order to avoid ground loops I bought an USB isolator with the ADUM3160 chip.

My Steinberg UR242 external sound adapter is detected through the USB isolator. It's shown in the Windows configuration and according to Windows it's working OK.
However the UR242 device is NOT available for audio input.

I'm using W11 with all the latest updates and tried several times after rebooting. The device is there, but not for input (or output).

What can this be?

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NOTE: I do indeed have TWO UR242 adapters installed. Neither of them works. Connecting just one doesn't change anything either.

This is the USB isolator I used:

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I tried adding a USB hub with it's own power supply between the isolator and the UR242. No success either.
The UR242 is detected immediately, but still cannot be used for audio input.
Buying more isolators with a "better" chip may be the next thing to gamble with.