Currently, co-editing Excel files during a Teams meeting is restricted due to organizational data policies and account permissions.

🔒 Key Limitations:

• Files shared in a Teams meeting are treated as organizational data.
• Participants without an Office 365 organizational account are considered external users.
• External users cannot co-edit or access shared files unless granted specific permissions outside the meeting context.

This is a known functional limitation, and we appreciate your understanding. For collaborative editing, consider sharing the file via OneDrive or SharePoint and adjusting access settings before the meeting.