Additional features, settings, or issues not covered by specific Microsoft Teams categories
Hi @Jane Ramsell,
You can refer to AI's response. It accurately explains that whether anyone with the join link can attend depends on the Event access setting chosen when the Town Hall is configured.
One point to be aware of is that Microsoft documentation states that Teams Free accounts cannot be used to join a Town Hall. Therefore, while a Public Town Hall allows external attendees to participate, users must still join through a supported Teams experience. In other words, "Public" means there are no organizational access restrictions, but standard Teams client and account requirements still apply.
However, Microsoft's documentation further notes that invitees without a Microsoft account can join anonymously when attending a Town Hall. Therefore, if one of your attendees is using a Teams Free account and experiences issues joining, you may suggest that they sign out and join through the event link as an anonymous attendee instead of joining with their Teams Free account.
Based on your webinar scenario, configuring the Town Hall as Public would generally be the most appropriate option if you want external clients to join using the event link.
I hope this information helps. If you need any further information, please don't hesitate to leave a comment.