Can I add my global and regional Facebook Pages to my Iconosquare account?

If you have a global Facebook Page that is split up into several regional Pages, you will be able to add all of the regional Pages but not the main global Page because of API limitations. You'll need to be the Admin or have full rights to each individual regional page that you wish to add. 

Unsure of how to check whether you have the correct permission/role on the Facebook pages? Check out this article.