As you know, Teams has been providing capabilities to host public event like webinar.
With these Teams webinars, you could not add external presenters when scheduling the event.
Well, good news, Teams webinar allows you to add external presenters during the scheduling process and will generate custom/unique join link for them.
The deployment is in progress – so if not yet available, try again later.
The deployment is expected to be completed by end of November for most tenants; deployment for government cloud tenants will start end of November and expected to be completed by end of December.