Why can't I enter emojis using their UNICODE codepoint value via hexadecimal numpad input?

Windows (Alt+Numpad Hex Input)
Step 1: Enable Hex Numpad Input
Check Registry Settings:
Press Win + R, type regedit, and navigate to: HKEY_CURRENT_USER\Control Panel\Input Method
Create a new String Value named EnableHexNumpad.
Set its value to 1 and restart your PC.
Alternative: Use the Alt + X shortcut (Word/Notepad):
Type the hex code (e.g., 1F600), then press Alt + X.
Step 2: Enter the Emoji
Hold Alt, press + on the numpad, type the hex code (e.g., 1F600), and release Alt.
Example: Alt + + + 1F600 = 😄.

https://www.tech2geek.net/why-cant-i-enter-emojis-using-unicode-hex-code-via-numpad/