Hi @GabrielTardin and welcome, it’s such a pleasure to have you here! 
Thanks for asking the HubSpot Community!
I’d like to share this article “Update employee permissions in the client’s HubSpot account” that might help you.
Regarding the paid seats, I would also recommend connecting with HubSpot Technical Support, as Support is included in your subscription and they will be able to provide real-time assistance for this matter, including hopping on a screenshare if necessary.
By the way, are you using the Breeze Customer Agent yet?
This agent scales customer support with an AI-powered expert that automates ticket resolution.
And please @GabrielTardin, let me know if there is anything else I can do to help you, I’ll be delighted to do so!
Have a beautiful day! 
Bérangère