How to use what3words voice navigation

It's very easy to navigate to a 3 word address. Drivers just have to say ‘Hey Mercedes, navigate to what3words vibes defaults classic’, select the correct suggested location and the car will start navigating to ///vibes.defaults.classic
About what3words:
what3words is the simplest way to talk about location. It has divided the world into a grid of 3m x 3m squares, each with a unique address made from 3 words. Now people can refer to any precise location - a delivery entrance, a picnic spot or a drone landing point - using three simple words.
what3words is helping improve businesses around the world, and paving the way for social and economic progress in developing nations. It can be used via the free mobile app or online map. what3words can also be built into any other app, platform or website, with just a few lines of code.
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The new A Class hatchback W177 version does not recognize this command of what3words from the MBUX. Why is it so ?