From the Ultimate Team HUB simply go to the PLAY tab and click FRIENDLIES then PLAY A FRIEND (you must either have them as a friend on your console or in-game using the EA ID - meaning cross-play, which I can confirm as my friend played on PC), invite your friend and choose any house rules (eg. No Rules or Mystery Ball), I chose Swaps. Simply complete the game, you may win, lose or draw.
I created this video to help:
Hope this helps.