What webinar platform?
On the accessibility webinar page at https://sway.office.com/ofnj0y3PT7dnqb0Z?ref=Link, perhaps it would be good to let potential participants know, in advance, what webinar access platform you use. So simple, yet not done.
Thanks for your feedback Jesse. For our accessibility webinars we use Skype Meeting Broadcast to communicate with our webinar attendees. Here's an article for more information on how to join a Skype Meeting broadcast https://support.office.com/article/use-a-screen-reader-to-join-a-skype-meeting-broadcast-2d9f8539-8072-4bd8-896f-af84494ad7d0?ui=&rs=&ad=