Transcription is not directly mentioned as a feature for shared mailboxes in Teams meetings https://learn.microsoft.com/en-us/microsoftteams/troubleshoot/meetings/teams-meeting-with-shared-mailboxes
Transcription can be started in a Teams meeting by going to the “More Options” section before the meeting, choosing “Record and transcribe”, and clicking the “Start transcription” button https://krisp.ai/blog/how-to-transcribe-teams-meeting/
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