Additional chat-related features and issues within Microsoft Teams for Education
Hello SJBOEGE,
Based on my experience, the hotkey Ctrl + A is not a feasible way to copy the entire conversation. We need to hold on the left key of the mouse then move up the mouse to select the conversations' content, and then press Ctrl + C and Ctrl + v to copy/paste them.
Maybe capture some screenshots of the conversation is a better way for backup.
Sorry for the inconvenience. Please do take care.
Regards,
Rudy