Hello there, JSpiers667x.

It's our priority to address the same experience you have between QuickBooks Online (QBO) and Shopify Balance. I also understand that's it's so important to sort this out, especially since it's the primary bank account for many users.  

I suggest reaching out directly to our Support Team. They can investigate why the QuickBooks OAuth process is failing after you've authenticated with Shopify. Here's how:

1. Within your QBO account, go to Help in the upper-right corner.
2. In the Search tab, click Contact us.
   
3. Enter a brief description of your concern.
4. Click Continue.
    

To ensure a seamless experience when contacting us, I encourage you to visit this article. This will help have a smooth process during your call: Support Hours.

Visit anytime if you have more concerns about QuickBooks integration. Providing you with help and accurate information is my top priority.