I get exactly � at almost every alt code I type. "é" and most other latin alphabet characters seem fine, but the majority of punctuation, symbols, and some letters don't show up.
I'm on Windows 10. In my world & region language settings, it's set to "English (United States)" and checked "Beta: Use Unicode UTF-8 for worldwide language support". I'm not sure if they might conflict with the alt codes?
The following do not work, but is what I tried.
For Σ, I'm using Alt+228 For ∞, I'm using Alt+236 For é, I'm using Alt+0233
It doesn't matter where I type these, Notepad++, Microsoft Word (Times New Roman), Firefox, Chrome, etc., I still get the same result.