Alexa support suggested the following utterance for setting the temperature in german using the Thermostat controller with Smart Home Skills:
Alexa.ThermostatController Interface German Utterances:
SetTargetTemperature:
Alexa, setze {device name} auf {X} grad
However this does not work, I have tried synonyms of verb setzen but still no success, can somebody at Amazon double check this and provide the correct utterance ?