Ensure it contains unique_id and the value for identifiers is a list.
{
"name": "AQISensor",
"device_class": "aqi",
"state_topic": "device/aqi/500291D66C79",
"unique_id": "put_something_unique_here",
"device": {
"identifiers": ["aqi"],
"manufacturer": "SuperJonotron",
"model": "PMS5003",
"name": "PMS5003"
}
}
For more information, refer to the example posted here: