The two top equations: what I actually write. The two lowest: What word produces

When I press 'shift+enter' after each line, the '&' dissappears, and the equations should align at '=', and this works every time in PowerPoint! But in Word, all my equations always align either to the left, or in the center (or whatever the align-settings are set to). I've tried to Google around, and the '&' is usually the answer, or to highlight all your equations-> 'right-click' -> align at '='. Or if I would like to align at a specific symbol, you can highlight the symbol in your first equation-line, selecting "align at this symbol".

The manual way works fine, but in some cases you would like to align your equations at different symbols, numbers, or even at empty spaces (typically polynomialdivision) to highlight differences in two equations (I teach math and science in high school).

As well as I would like to keep my fingers on the keyboard, reducing the need for my inaccurate mousepad, and ultimately: save a couple milliseconds each time...

So, my question is: why won't the '&'-sign work?