Microsoft Graph
A Microsoft programmability model that exposes REST APIs and client libraries to access data on Microsoft 365 services.
11,448 questions
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I keep getting this error whenever I try to post message in channel.
You are using MS Graph Send chatMessage in a channel or a chat with a personal Microsoft account (MSA account) and this is not supported. This API is only supported for users with AAD/Work accounts.
Try with and AAD/Work account with a Teams subscription and let us know.