Problem with field url

I need to linh a title h1 with the an url. I´ve created a custom field with Advanced Custom Fields for this url, but can´y make the link.

¿Is this correct?

<h1> <a href="[field url=enlace_principal]">[field title]</a></h1>

Sorry for my bad english.

https://ww.wp.xz.cn/plugins/custom-content-shortcode/