I created several Copilot Studio agents, in which I added the Teams+365 channel.
I published them, and I was able to access them from Teams.
I could chat with them in private chats with them, and they worked.
I could even add them to a team(to an specific channel).
The problem is that whenever I mention the agent in a post within a channel, I get the error:
"Sorry, something unexpected happened. We’re looking into it. Error code: SystemError"
The agent is not able to write in the channel, but there is a reaction to my messages.
* I tried with several agents using different options.
* I tried changing permissions in Entra for the app.
* I tried to change the permissions of the manifest and upload it to Teams-admin.
In all cases, and for all agents, the result is the same.
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