Hello,
This sounds like a potential hardware fault. The USB ports don't seem to be working either, as you can't see any USB3 hub in the tree. The DisplayLink chip, like the free USB3 ports, are connected to the hub internally. Chip needs to talk for a driver to work.
If I had that dock out of warranty, I would try to use the Dell Flashing Utility from Dell website from a Windows machine in USB-A mode without anything connected downstream to the dock, and force an update. But if it's under warranty, I would ask the manufacturer.
To sum up, I recommend you contact the manufacturer tech support (Dell) via a ticket to discuss a replacement, if you can.
Regards,
Alban
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