Hello Alexandra, My name is Indhurani, I’ll be happy to help you today.
Yes, in a Teams webinar, as the organizer, you can assign the presenter to also be a co-organizer. In fact, the co-organizer role can be assigned to any participant, and they will be displayed as additional organizers in the meeting participant list and will have most of the capabilities of the meeting organizer.
This includes the ability to manage participants, share content, and control various meeting settings.
However, note that promoting someone to a presenter role during the meeting does not automatically assign them as a co-organizer. The co-organizer role needs to be assigned separately from the presenter role.
For more information: https://support.microsoft.com/en-us/office/role...
Hope it helps you. Please let me know if you still need further assistance.
Regards,
Indhurani