how to show a shortcode inside a popup | any secret code?

Hello,

I'm looking to use a shortcode inside your popup plugin because shortcodes are not recognized.
I checked in google and I find some old suggestions as:

<?php echo do_shortcode( [your-short-code-here] ) ?>

But it's not working.

Do you have a secret code to enable a shortcode inside a Popup?

Thanks
Simone