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There is a good support document on the MS site. This scrap is from that doc. Check out the full document for all the possibilities.
Play a meeting recording
The recording will be available after the meeting was scheduled to end (so not necessarily when it actually ends).
If you were part of a scheduled meeting, go the Details tab of the meeting event in your calendar and select the recording.
If it was a channel meeting, go to the channel conversation and select the recording.
You can also select More actions on the meeting recording and choose Open in OneDrive if it was a chat meeting, or Open in SharePoint if it was a channel meeting.
For channel meetings, the recording will be stored in a Recordings folder in the Files tab for the channel.
The Files tab stores all files in a SharePoint site and document library for the channel. Everyone who is a part of the channel will have permission to edit and view the recording.
All other meetings
For non-channel meetings, the recording will be stored in the Recordings folder in the OneDrive directory of the person who started the recording.