There is inavailable to set your xbox to play 2 players vs 1 online, you only can set one player vs one online, if you want to learn more tips about FIFA 20, you can read this article: http://blog.fifacoin.com/interactivity-tweaks-you-need-know-in-fifa-20.html?aff=222703, you also can buy cheap FIFA 20 Coins on FIFACOIN.com

Have you made sure that you both have xbox live to play if one of you have try having the other login as a guest so it will use the gold that the gold account holder is useing try that if not then double check your xbox live settings just to make sure :)