I have no personal experience of the pi400 but I believe the ethernet hardware is identical to the pi4. Could it be a configuration problem? Can you run snoopy or equivalent on the network segment and see if the dhcp requests are being transmitted? And check the dhcp server log to see if there's a reason for non-response? Also you can try using ipconfig to set a specific ip address and gateway without using dhcp, to see if it's a dhcp problem or a more fundamental ethernet problem.
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