I'm getting an error about not having permission.

Are you getting the following error?

Currently the Attendance Taker app requires that you be a meeting host in order to take attendance, which is why you were getting this error.

As one possible workaround, we have a separate Meeting Timer and Attendance App that joins meetings as a Zoom participant. Because of this, it takes attendance in a different way, so it can take attendance even if you are not the meeting host. You can install that app here.