Jorge - Here's an oldie but moldy post from 2014 where another iFly user had a similar issue resolved. 2014 was a long time ago in iFly age, so screen layouts etc. have probably changed. It looks to me like the key might be in setting the Dual to ADS-B mode and not GPS mode.
https://www.iflygps.com/SUPPORT/Forum/tabid/108/forumid/17/postid/14965/scope/posts/Default.aspx
Good luck!