I've been running into a sporadic similar problem with the Meet Attendance reports. There have been instances in which the Meet does not generate a report for the meeting organizer after the meet has ended. In our instance, the organizer has created the Meet from their Google Calendar to ensure that they remain the organizer and then posted that link in their Classroom. They are not using the integrated Classroom feature to eliminate the possibility of many of the problems listed above.
As the domain admin, when I investigate using the Meet Quality tool I can see that the organizer is the correct organizer and that person is both the first and last person in attendance. Yet no report was generated.
Additionally, I used the email log tool to search for the generated report email and could not find any record of this report getting generated and placed into our email pipeline. It was not sent to the organizer or any other person in the domain.
Wondering if there are any other options to look into to figure out what is happening here?