Lots of posts get made and it’s possible to miss quite a few. It’s where things are important to reply to keep things alive.
The other issue here is that the last reply from OP is that they think they figured out the issue. In a nutshell, they were saying that they weren’t signed into Premium when they did their presentation. If that’s the case, then it means it wouldn’t have been able to record as recording is available for premium only. And as you aren’t required to have an account to join in on a Brave Talk call, it could easily be missed.
Just to confirm, were you indeed signed in and set to record?
I’d also advise you to create a Premium Support Ticket at https://support.brave.com/hc/en-us/requests/new?ticket_form_id=360003078831 so someone from Brave, such as @B-Lee, can try to help.