Well, that’s actually the same webinar ID (not uuid) but recurring every 2 weeks.
Therefore I used Get Past webinars API in order to return a list of webinar instance with their UUID.
Then I sent each UUID to the get recordings API and it worked!
Possible improvement in the API: make the Get Past webinars to sort by default on start_time and enable pagination to avoid fetching long list or provide a filter on date.
Thanks