I appreciate you for contacting Integromat ahead, mf_edwards.
For questions related to QuickBooks and API integration, we have a separate Community forum that handles this. All of your concerns will be answered directly by the Intuit Developers. You can open this link in your browser to be routed to their site: https://developer.intuit.com/app/developer/homepage.
One of our developers can check what's causing the issue and assist you further. Just copy your post here, and then paste it on the other site.
Thank you for your patience and for clearing things out for me. Please let me know if there's anything else I can help you with.
