Sorry, I don’t know much about how elementor works with ACF. That is in their plugin. And I’m not exactly sure what type of field is working. If you are talking about the user field that relates the post to user then this field is saved to post meta for the post and not user meta for the user. In the end this is something you need to resolve with elementor. As I said, more than likely you will need to build custom code in the form of a shortcode to allow showing the field.
