Hello and thank you for posting!
Based on your description, it sounds like the dock may not have been authenticated (or ‘Approved’) in the Intel Thunderbolt software installed on your system.
If the dock is not approved, only the video outputs will work. The USB ports, Ethernet port and audio port will not function.
We have a description of how the authentication process is supposed to happen when the dock is first connected on our product page here → https://plugable.com/products/tbt3-udv/#Authenticate
Can you double-check within the Intel Thunderbolt software under the ‘Manage Approved Thunderbolt Devices’ section that the TBT3-UDV dock is shown as an ‘Approved’ device, similar to the following screenshot?:
Thank you,
Bob
Plugable Technologies