Text-based conversations between users with searchable history in Microsoft Teams Free
Hi Tony,
To further check on this, are you referring to the chat transcript from your previous support case from live Microsoft Support Agent? If yes, then please note that this community is composed of fellow Microsoft users, as we are not Microsoft employees and do not have access to tools or systems to further check.
With that said, I highly suggest to contact back live Microsoft Support and check whether they can send you the transcript via email. Although its not guaranteed that this is possible but they are on the position to confirm this.