Microsoft does note discoverabiltiy being a factor for this new shortcut in the blog: "We are trying out a new experience to improve the discoverability of the emoji and more panel in Windows 11." ...

And that's understandable, because you probably didn't know there was a quick way to use your favorite emoji (and even kaomoji) on Windows 11 (and 10) using a keyboard shortcut. That's right ...

Emoji Panel lets you use emojis in any application on Windows 11/10 ... can’t access or see the emoji panel using the keyboard shortcuts. Sometimes, restarting the PC might fix the issue ...

you won't find a dedicated button to access emoji. You will have to use one of the Windows keyboard shortcuts to access the emoji window, so that you can then choose the white heart emoji from there.