opt-shift-k gives me the expected Apple logo character in Notes and TextEdit, but in Mail I just get a square box. Same in a Flashcard Hero app I have. It used to work everywhere, but now, at least in Sonoma 14.3.1, it doesn't work some places.
(seems to work here)
I also have a keyboard text replacement set on my computer where I can type "apple logo" without the space in between and it puts in the character. That's not working in the same places opt-shift-k isn't working, so I guess the problem is in the Mail app and the Flashcard app.
Is anyone else finding this problem? Any ideas? I don't find any threads here on it, or on the web. Perhaps it's a new thing.
After more research I figured it out. It's a font problem. I'm using Verdana in Mail and the Apple character is missing.
(I'm using Verdana because it shows the capital of the i character distinct from the lower case L character. For instance, when abbreviating Artificial Intelligence to two letters it's confusing.)