Here is the step-by-step guide.
Replace "YourPolicyName" with the actual name of the policy you wish to modify. If you want to create a new policy or modify the global policy, you can use "Global" or a specific policy name you've created. Here is the step-by-step guide
Grant-CsTeamsMeetingPolicy -Identity "username" -PolicyName "NoTranscriptExpiration" Here is the step-by-step guide