Well, by the error, I recommend you see the permission of this account. You can see the configurations on the tab Account Management -> User & Teams, Look if the account has the Super Admin permission. If you have already seen what I recommended, you can see this post https://community.hubspot.com/t5/APIs-Integrations/How-can-retrieve-roles-with-users/td-p/1018767 . Maybe it helps you with your problem.