Thank you for sharing your concerns here in the Community forum, dan. Let me direct you to the appropriate support channel to address your authorization issues.
We have a highly dedicated and specialized community that specifically handles questions and challenges related to system integrations and API-related issues. The Intuit Developer community consists of experienced professionals and experts who can provide thorough assistance and detailed guidance to help resolve your concerns and advance your projects.
Here's how you can reach them out:
- Visit the Intuit Developer Support website.
- Scroll down and choose your OAuth 2.0 tile.

- Click on Ask a Question.

- Follow the onscreen prompts.
I've compiled some resource articles on working with OAuth 2.0. These cover various aspects of its implementation and usage, providing valuable insights and practical guidance:
We're here to help if you need further assistance with any QuickBooks-related issues or have additional questions. Click the Reply button, and we'll respond promptly to address your concerns.