Reports

Sounds like you were very close. In the web portal go to Reports >

Meeting and webinar history

If this works please click accept as solution.

You need to combine the registration and participant reports to get a tally of who attended and for how long. You can download both in the Zoom portal and reconcile them in excel. If you want to automate this there is a Zoom app, Salepager, that lets you export combined attendance and registration reports.