Can't Use API to Get Channel Message or Post message to Channel

DaiDaniel 1 Reputation point
2020-12-03T09:00:10.647+00:00

Please help me.It is a big problem for me.Thanks!!!
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When I want to get channel's message , it showed "unknownError".

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When I want to post message to channel, it will show "unauthorized".

Microsoft Security | Microsoft Graph
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