Experience Fragments not working for Form based campaigns in Adobe Target

Hi All,

We have integrated AEM with Adobe Target and we are able to create VEC campaigns and use experience fragments and able to get it work. We need help or procedure how to leverage XF's  with Form based campaigns in Adobe Target. We have created a Form based campaign on global mbox and used XF's we don't see our campaign loading. What are the additional pre-requisites needed to load form based campaigns with XF's. Any help or related documentation much appreciated.

Thanks in advance!!