Thanks for taking the time to reach out to the QuickBooks Community, @alexabreuegt.
I'm here to guide you to the right support and make sure you'll get the best help with your Access Token.
You can post your concern in our Intuit Developer Forum and interact with different experts to get the help you need. They're geared on developing applications that integrate with QuickBooks.
You can contact them through this link: https://help.developer.intuit.com/s/.
Please know that you're always welcome to post if you have any other questions. I'm always here to help you out.