Copilot Studio agent cannot send messages in team-channel (Sorry, something unexpected happened. We’re looking into it. Error code: SystemError)

Question

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.

Answer 1

Currently seeing similar issues, is it possible to get an update what the issue was?

Answer 2

Hi Paul,
Thank you for reaching out and providing details about your issue. I appreciate your patience as we investigated this matter. 

After thoroughly testing and attempting to recreate the issue on our side, we were unable to observe any irregularities. Everything appears to be functioning as expected, and no errors were detected. Additionally, based on our assessment, all the necessary permissions seem to be correctly assigned to your account, ensuring full access as intended. 

Since we were unable to replicate the issue or identify any misconfigurations, I recommend that you raise a support ticket with our dedicated technical team. This will allow us to perform a more in-depth investigation, including account-specific diagnostics and system logs, which may provide further insights into the issue. 

Here are a step-by-step guide to help you contact a Microsoft Support agent: 

1. Go to Contact - Microsoft SupportType "Contact support" into the search bar. 
2. Click on Contact us => Choose the product you want to work on.
3. Click on "Get Business Support" 
4. Sign in as your admin credential
5. Type any issue into the search bar => Click on "Get help from one of our support agents" (the headphone symbol" => choose method that you want to contact. 
6. Fill in the required information and wait for the agent to contact to you through the information that you provide.

We hope this helps! If you have any further questions or need additional assistance, please feel free to ask. 

Best regards,  

Hendrix - C - MSFT | Microsoft Community Support Specialist.

Answer 3

Hi Dustin,
thank you for your answer.

I have done more tests, because I had doubts about the permissions to write in channels.

This time, I did:

* I registered a new application in MS Entra, according to the guide in Configure user authentication with Microsoft Entra ID - Microsoft Copilot Studio | Microsoft Learn
I added the following permissions (just to be sure that nothing was missing):

* Then created an agent in Copilot Studio using manual authentication (using secrets created in the former step in Entra)
I added the following scopes in this step:
ChannelMessage.Read.All ChannelMessage.ReadWrite ChannelMessage.Read.Group ChannelMessage.Send Chat.Read Chat.ReadBasic Chat.ReadWrite Chat.ReadWrite.All Chat.Read.All ChatMember.Read ChatMessage.Read ChatMessage.Send Group.Read.All openid profile TeamsTab.ReadWrite.All TeamsTab.ReadWriteForChat.All TeamsTab.ReadWriteForTeam.All User.Read

* In Teams Admin Center I have:

And despite that the authentication method is totally different, I obtain exactly the same behavior.

With respect to your suggestions:

1. You wrote:
   "Enable Bot Messaging in Teams Admin Center
   -> Go to the Microsoft Teams Admin Center. -> Navigate to Teams apps → Manage apps.
   -> Search for your Copilot Studio agent and ensure that bot messaging is enabled.

#Where do I check that?

"Also, check App Permission Policies to confirm that bots are allowed to send messages in channels."
#Please check all the permissions that my agent has.

Check Tenant-Wide Settings for Bots
#I allowed as much as possible (it is a testing environment)

2. You also wrote:
   "In Microsoft Entra Admin Center, go to Enterprise Applications → Your Copilot App. -> Under Permissions, ensure that the bot has Teams.ReadWrite.All and Chat.ReadWrite permissions.

#Check also in my image all the permissions assigned and granted in MS Entra.By the way, I could not find the "Teams.ReadWrite.All" permission (neither in Application, not in Delegated)

Any other ideas..?
Could you check if there is a ticket for agents not being able to write into posts in Teams-channels?

Answer 4

Dear Paul, 

Thank you for reaching out to Microsoft Community. We're happy to assist you. Kindly try the following suggestions to resolve: 

Enable Bot Messaging in Teams Admin Center 

• Go to the Microsoft Teams Admin Center.
• Navigate to Teams apps → Manage apps.
• Search for your Copilot Studio agent and ensure that bot messaging is enabled.
• Also, check App Permission Policies to confirm that bots are allowed to send messages in channels.

Check Tenant-Wide Settings for Bots 

• In Microsoft Entra Admin Center, go to Enterprise Applications → Your Copilot App.
• Under Permissions, ensure that the bot has Teams.ReadWrite.All and Chat.ReadWrite permissions.

Contact Microsoft Support for Escalation 

• Since this issue persists across multiple agents, it may require Microsoft intervention.
• You can submit a support request via Microsoft Support.

Ticket Support: In the Microsoft 365 Admin Center>Support>Help & Support. You can raise support ticket   

https://admin.microsoft.com/#/support/requests       

We hope this helps! If you have any further questions or need additional assistance, please feel free to ask. 

Best regards,  

Dustin - TP - MSFT | Microsoft Community Support Specialist.