How can i use alt symbols on photoshop CS6?

OS: W10/W7 64bits.
PS: CS6

I want to use musical and math symbols, but they do not seem to work.

For example the musical flat symbol: ♭.

According to plenty of websites, the alt code is alt 9837:

https://www.cyberdefinitions.com/music-symbols.html
https://www.webnots.com/alt-code-shortcuts-for-music-symbols/
https://www.alt-codes.net/music_note_alt_codes.php
https://altcodesguru.com/music-note-symbols.html

However, when i try and press alt 9837 i get an m, i tried alt-gr but nothing happens.

If i try to copy-paste the symbol and paste it in a photoshop text box, but i get an empty blank square like this: □.

I have num lock enabled and added to the registry EnableHexNumpad with a value of 1, so alt codes should work on photoshop, what is wrong?