Here are the steps if it can be useful for somebody.
1) You had to opt-out from the new Stream.
Set-CsTeamsMeetingPolicy -Identity Global -RecordingStorageMode "Stream"
2) Create a custom meeting policy (nammed Policy_Stream_Onedrive_Recording for example) and assign this policy to some users.
3) Execute the following command:
Set-CsTeamsMeetingPolicy -Identity Policy_Stream_Onedrive_Recording -RecordingStorageMode "OneDriveForBusiness"