Larian Studios Forums Baldur's Gate III Baldur's Gate III - Build Discussion Multiclassing -> what class to pick first?

There was a youtube tutorial where it was stated that you can first pick a sorcerer for example and at 2nd level you pick a war cleric and get the extra armour class. can't find the video however. maybe someone can confirm this and if so, where else does this work - or is it a bug?