Welcome to the Community, @contact55. At the moment, there's an on-going investigation and our engineers are now working to identify the cause of why you're unable to connect your Amazon account to QuickBooks to fix the issue.
I'd suggest contacting our Technical Support team and provide this investigation number: INV-41031 for easy tracking. That way, they can add you to our list of affected users and get notified with its progress through email.
Let us know if you have any questions. We'll be right here to help.
