then there's a permission issue, checking
router # [ 8.841737] kea-ctrl-agent[780]: 2025-07-08 22:45:53.570 ERROR [kea-ctrl-agent.ctrl-agent/780.139821817276288] CTRL_AGENT_CONFIG_FAIL Control Agent configuration failed: socket path:/run/kea does not exist or does not have permssions = 750
RuntimeDirectoryMode = "750";
RuntimeDirectory = "kea"; RuntimeDirectoryMode = "750";