QB Issue Resolution:

Please go here https://developer.intuit.com/app/developer/homepage and log a ticket. Our Development Team would help you get your issue resolved.

Resolution for Issue 'IN: Hii Sir, I want to integrate qb online in my offfice 365 site how I can do this.' available: Yes (Solved).
Source: Intuit Community forum.

IN: Hii Sir, I want to integrate qb online in my offfice 365 site how I can do this.: 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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