I have already downloaded the attendance list, but as I said, it just shows “Guest” for many of the people. Normally it shows their name, as you can see from the previous one
How does it look on the Attendance tab in the meeting object? (Not the downloaded file). Normally names are not visible only when participants join as anonymous users, i.e., not signed in using a browser session. Try scheduling a new test meeting to see if the issue persists.