iTunes Store In-APP Testing issues

Hi,

I’m about to launch a version 2.0 of my app which permits the end-user to do in-app purchases. This new version includes new items to be purchased.

While testing new items purchases, i get the iTues Store login popup, but after entering my testing user and its passxword, I get a second login prompt (coming from the iTunes Store) and after enetring again the new value, my marjet callback event gets a " Couldn’t connect to iTunes Store" error.

My testing account is included in my sandbox testing list of my iTunes Connect account.

Any ideas? Do i need to upload a binary of my new app version before testing in-app purchases?