Could you provide us the error message?
After the recording has stopped, it is processed (which could take a while) and saved to Microsoft Stream, and then it is ready to play.
For more details, please refer to this article: https://support.microsoft.com/en-us/office/record-a-meeting-in-teams-34dfbe7f-b07d-4a27-b4c6-de62f1348c24?ui=en-us&rs=en-us&ad=us.
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