Hello @Liz1000 and welcome to the Help forums. Your new Sense has the firmware from when it was manufactured. The ECG app was added in an update that came out shortly after it was released. But I have some bad news for you. It isn't available in NZ yet. The list of supported countries is here. There really isn't any way to know when a country will get added. In the US, this app has been cleared by our Food and Drug Administration. New Zealand's equivalent agency needs to approve it before it can be made available.
Laurie | Maryland
Sense 2, Luxe, Aria 2 | iOS | Mac OS
Take a look at the Fitbit help site for further assistance and information.
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