Creating email alert using Matlab, but getting error

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Hi Team

I am trying to create native code for matlab analysis about email alert. But i am getting an error below and my code is below. Question which API key must be supplied here? The Alert API Key both on my Matlab and PostMan? I am following this link below and note my channel is set under settings as private channel.

https://www.mathworks.com/help/thingspeak/sendalert.html

data = thingSpeakRead(929272, "NumMinutes", 100);
aveTemp = mean(data(:,7));
apiKey = '****';
alertURL = "https://api.thingspeak.com/alerts/send";
options = weboptions("HeaderFields",["ThingSpeak-Alerts-API-Key", apiKey]);
alertBody = sprintf("The temperature is %0.2fF.", aveTemp);
if avg_temperature > 60.0
    webwrite(alertURL, "body", alertBody, "subject", alertSubject, options);
end