Hi @Ernest Reager
According to your case description, you intend to clear the history in Microsoft Teams:
Delete a chat in Microsoft Teams
- From the Chat tab, find the chat you want to delete. Note: You can delete one-on-one, group, and meeting chats.
- Hover over the chat and select More options.
- Select Delete and then confirm that you want to delete it.
Configure the retention policy for Microsoft Teams
Visit the Microsoft 365 admin center. Navigate to the "Compliance" section and select "Information Governance". Create a new retention policy and select the chat and channel messages that apply to Teams. Configure the retention policy and set the retention period and deletion time.
For detailed steps, please refer to:
- https://learn.microsoft.com/en-us/purview/retention-policies-teams
- https://learn.microsoft.com/en-us/microsoftteams/retention-policies
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