Help requested, received message :Ethernet not connected

Hello, I do have a Dreamlink T5, I bought a used Dreamlink Hd for another TV. The T5 have internet via a dongle (Vonets) and it is working perfectly. I plugged the Vonets on the Dreamlink HD and constantly have the message : Ethernet not connected. When I unplug it write the message for unplugged.

Do you have recommendation? Is it a programming issue?
If someone can help me it would be very appreciated. I'm thinking ro send for repair as I really don't know what is the issue.

Thanks,

Bypass the vonets and see if it works

In the DL-HD network settings could be set to static, instead of DHCP