SDM API calls are returning Enterprise not found

Question

I'm calling the SDM API using the google-api-nodesj-client package, and receiving an Enterprise not found message when I try to set the temperature.

The API returns a 404 on the nest.enterprises.devices.executeCommand call with the following error block :

message: 'Enterprise enterprises/long-enterprise-id-here not found.',
domain: 'global',
reason: 'notFound'

async function setTemp(device_name, tempFahrenheit) {

    const auth = new google.auth.GoogleAuth({
        scopes: ['https://www.googleapis.com/auth/sdm.service']
    });

    const authClient = await auth.getClient();
    const nest = await google.smartdevicemanagement(
    {
        version: 'v1',
        auth: authClient,
    });

    // Do the magic
    try {
        const res = await nest.enterprises.devices.executeCommand({
            name: device_name,
            requestBody: {
                "command" : "sdm.devices.commands.ThermostatTemperatureSetpoint.SetHeat",
                "params" : {
                    "heatCelsius" : getCelcius(tempFahrenheit)
                }
            }
        });
        console.log(res.data);
    } catch (e) {
        console.dir(e);
    }

}

I haven't found anything in the SDM documentation that alludes to this error. It feels like a GCP service account configuration issue but I can't make sense of it.