QB Issue Resolution:

Let me direct you to the support who can provide more details about the QuickBooks Sandbox, qbqa.

 

You can post your questions about the Sandbox application by following these steps:

  1. Go to: https://help.developer.intuit.com/s/.
  2. In the Intuit Developer page, select QuickBooks Sandbox.
  3. Click the Ask a Question button.

Resolution for Issue 'We have 2+ QBO test accounts and a sandbox application with client_id. Is it possible to connect to this application from second QBO account (not owner of application) ?' available: Yes (Solved).
Source: Intuit Community forum.

We have 2+ QBO test accounts and a sandbox application with client_id. Is it possible to connect to this application from second QBO account (not owner of application) ?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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