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unity for Hololens2

Hello, I'm a beginner of hololens. I downloaded the demo of vuforia for hololens and posted it to hololens 2. The runtime will prompt whether to obtain camera permissions. After clicking "yes", the image target is working; However, after I joined the Photon Unity Networking, it is good to use webcam debugging in unity editor, but when it is released to hololens 2, there is no prompt to obtain camera permission at runtime, imageTarget not work.

Unity 2020.3.14, vuforia 10.7.2

Can you help me ?