Clamp Font-size Not Working Properly?

I’ve tried to find some how-to vids on using the clamp for font size, and I must not be doing it right so I figured I’d ask for a how-to here.

I want the minimum font-size to be 12px and the max size to be 15px. Here’s the calculated clamp for that: font-size: clamp(0.75rem, 0.7125rem + 0.1875vw, 0.9375rem);

Yet when I paste it into Bricks in the font-size for typography, it is defaulting to 8.51px and not scaling at all. I don’t have any custom CSS for the div or anywhere else on the section. Any suggestions?