This entity does not have a unique ID

[pssc (Phill)]

See:-

HA.core REST API POST unique_id for entities?

This work for me. Put it in configuration.yaml or where appropriated. template: - sensor: - name: your_sensor_name unique_id: your_sensor_name state: '' Then the REST API POST will update state as usual. And you can customize this entity through UI.

For something that may work using templates to add the ID’s