Hello Ivan! I assume the Eve Energy are in range to the HomePod mini, like 10-15 meters. In this case please try a tipp from Apple: Thread accessories might not use Thread following initial setup and instead use Bluetooth LE.
Workaround: Move the accessory near the home hub, then toggle the accessory state several times. I would just pull the Eve Energy out for one minute and plug it in again. Wait 2-3 minutes then. If this does not help please open a ticket in our support system:
Best regards, Volker
Nov 24, 2021