Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
I am not a Scoutbook or Internet Advancement use expert. So I am not in a position to help with the details. However you will need to be using Scoutbook OR Internet Advancement 2.0, not both.
There is no reason for units that use Scoutbook to use Internet Advancement. For more information on how to use Scoutbook see the getting started guides here
Here are some comments from another discussion topic.