Solved
I didn't get my reward"eidolon",the maps called The Challenge Hamada
起初，我的英语不好，我很抱歉，我的问题是我玩了一张名为"挑战滨田"的地图，从联合武装，它非常无用，并花了我2天，当我们完成游戏时，我的朋友他们都拿走了奖励，但我，甚至没有显示在我的军械库，我非常喜欢这个奖励，请帮帮我!!! 而且我不想再玩了，我的手上全是汗水！
- Sorry, we don't have any Chinese support here, so we'll close the thread.
As for the issue, as noted in the other thread on the matter, this isn't something we can help with, and your only option is to do the challenge again: https://answers.ea.com/t5/Battlefield-V/Missing-Eidolon-rewards-after-completing-The-Challenge/m-p/11443168#M81797
