How to use UI to control camera in Hololens2?

Question

I want to use UI to move camera in Hololens2. When I directly control Main Camera, it does't works in Hololens。

Then I control MixedRealityPlayspace to move on Main Camera's axis.

Game.Find("MixedRealityPlayspace ").transform.Translate(new Vector3(0,0,2), Game.Find("Main Camera").transform)

This works in Unity Editor, but not work in Hololens。

Is there any method to solve this problem?