Ding-dong speaker app can't log in because of data corruption or high system version, and then the hardware is incompatible. You can try to update the Ding-Dong speaker app or reinstall it. If it still doesn't work, you can contact the customer service staff of Ding Dong speakers.
Ding-dong speaker app is a smart mobile phone software released by Beijing Linglong Technology Co., Ltd. for its hardware equipment of the same name.