Pre-registrants don't see the join button when a meeting is in progress

[neurodiversetm]

Can someone help troubleshoot to guide us on how to enable the "join" button to appear when prospects register at https://bit.ly/nltm-rsvp and a recurring meeting series is in progress?  Pre-registrants for another nonprofit with similar Zoom settings and an alias see the "join" button when their meetings are in progress.  The only difference may be to remove the passcode in both the account and meeting settines, which we thought we did given we secure using waiting room because attendees find it hard to remember different links and passcodes as well as may not know or want to log into a Zoom account to bypass authentication.

There are too many settings in Zoom to troubleshoot and test.  Hence, we'd appreciate guidance to resolve this problem efficiently.