How to make button work without parametres

How to make a popup work on call with a button but without parameters
aria-controls="fancybox" aria-haspopup="dialog"

The essence of the problem is that the “Notify” button with a pop-up and a form is added to the product variations, but the variations are loaded by Ajax, and the button is added without parameters, and accordingly the pop-up is not called.
Without variations (without ajax) everything works as it should…

code of button
<a href="#popup-notify" class="button button-alt fancybox-inline">Notify me</a>

I would be grateful for the hint, I have already tried a bunch of options …