Thank you for posting! I am sorry things are not working fully as expected while using your new TBT3-UD1-85W docking station and I would be happy to help.
The behavior you describe is of course not expected, so our next step is to get some additional information.
Since this additional information will include personally identifiable information, please send the following information to us directly via email@example.com with ‘For ticket 330806’ in the subject line. This will allow us to match things up and determine the next steps.
** Please do NOT post this information here in our public forum. Please only provide this information within your direct email to firstname.lastname@example.org **
When the Ethernet cable is connected to the dock’s Ethernet port, can you please let us know if you see a solid green connection light and a flashing yellow activity light within the dock’s Ethernet port? This helps us to determine if a physical network connection is being established.
Can you please provide the Amazon Order ID number for your TBT3-UD1-85W purchase?
Can you please keep the dock connected to your MacBook Pro and the Ethernet cable connected to the dock (even though not working as expected) and provide us with a PlugDebug file --> https://plugable.com/pages/plugdebug This will allow us to examine some log files from your system in order to help determine the next steps.
Apologies again for the frustration, and thank you for giving us the chance to help!