Hi @johnkeck,
Thanks for the reply. As mentioned in the https://support.zoom.us/hc/en-us/articles/360037117472-Authentication-Profiles-for-meetings-and-webinars, this feature requires the participants to log in to join a meeting, which means the participants need to either using email to log in or use SSO to log in. Using the token to join a meeting(API user) does not meet the requirements so it is not working.
Hope this helps. Thanks!