Fixed
Revert locationRefreshMode to string values - v1.2.1 incorrectly changed locationRefreshMode from string ("REFRESH" / "DO_NOT_REFRESH") to numeric (1 / 0), which broke location tracking and battery level for all users. Reverted to the original string values expected by the Google Kids Management API. (#89).
If you updated to v1.2.1, please update to v1.2.2 immediately to restore location and battery level functionality.
Upgrade
Update the integration via HACS, then restart Home Assistant.