Hi @J2RC
Now you want to start a new clean chat with a Copilot Studios agent in Teams and delete all previous messages.
According to our tests, start a new chat:
In an existing conversation, enter the "Restart" or "Start again" command. This will immediately start a new conversation and see the agent's latest updates. But it will not delete all previous messages.
When you customize the topic of the Copilot Studios agent, you can give different trigger phrases to achieve the results you want. For example, a sentence to restart, or automatically start a new topic after ending the conversation.
Currently, the Copilot Studios agent does not support the ability to delete a single chat history or clear all messages. To delete all chat history, you need to delete the entire agent in Copilot Studio. If deleting the agent does not meet your needs, you can create a new agent and start a new conversation.
Ref: https://learn.microsoft.com/en-us/microsoft-copilot-studio/authoring-first-bot?tabs=web
https://learn.microsoft.com/en-us/microsoft-copilot-studio/fundamentals-get-started?tabs=teams