I created an alphabet directly via illustrator ( v 27.4 ) working from a mac desktop. I tried importing A-Z and then one letter at a time. In all cases the letter(s) appears in the lower menu but in the preview area. i i only get one rectangle with an x through it. below the letter in the lower menu I get an x on an orange background. i saved to system font folder and see the font name.otf. when i try and add letters in illustrator each letter is a rectangle with an x through it on an orange background.
i restarted illustrator and the computer. i’m running macos ( v 12.5 )