Son has no multiplayer access on Battlefield 5 and Battlefront (xbox one)

Im sure it is to do with his account being a child account but my son can access and play Fortnite online with friends but can only play campaign on Battlefield and Battlefront.

As we purchased Starwars and Battlefield for him as gift its rather frustrating that he cant access multiplayer content and that as his parents we cant decide on if he is mature enough or responsible enough to have access to online content although it seems EA are ok with us paying for Fortnite content etc and also allow him to have an EA subscription each year.

Any help would be appreciated to allow him to access the full content as these games have been purchased online against his gamer tag so we cant just create a new one for him.

Many Thanks.