why my facebook app can't receive pages webhook?

Question

I tried to make a bot that responds to clients' messages and comments. Webhook only be sent when user chat with page, but when user reply or post, I can't receive any webhook. I have 'pages_manage_metadata' permission and set up my code for receiving page webhook. This is my permissions:

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but in graph api explorer I can't see these permission

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and I can't get page access token, this wrong appear: (my app passed app review successfully and in live mode)

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So how can I solve this problem.

Thank you so much.