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Based on my research, Webinar Registration Report takes about 24 hours to update. Here are some possible solutions to try to view and download the attendance report:
- Check if the report is available the web version the web version: https://teams.microsoft.com/ and see if the report has been generated there.
- Teams Admin Center > Users > Manage Users> Choose the display name for the meeting organizer > Meeting & calls > choose the appropriate meeting ID or call ID > Participant details > To download the attendance report.
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