Cesium3DTileset disappear in Unity when I click play

My Cesium3DTileset shows up fine while I am in my scene view, but it totally missing on game view when I click start the game. Could someone help me with this, thanks!

Quick check: Make sure you have he MainCamera Tag in your camera game object

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Oh, thank you so much, the problem is solved. Iā€™m really grateful for your help!