@Michael_McGowa1 please come back to the thread and mark my answer as the Solution, thx.
Hey Sanford, that didn't work for me. Researching this more, thought I would share what has worked for me is using the HTML entity of the emoji in the preheader i.e. 📋 for a clipboard.
Can't imagine what you're doing differently, but if you have another way that works for you, great!