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个人微信不能在企业微信群里发消息是什么原因？What is the reason why personal WeChat cannot send messages in corporate WeChat groups?

What's the reason why personal wechat can't send messages in the enterprise wechat group? As shown in the figure, customers can't send messages in the enterprise wechat group, but they can receive messages. Private chat with customers on wechat can send messages

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