QB Issue Resolution:

I’m not sure if Enterprise is the same as Accountant (which I use), but it depends totally on which company you open first.  The second one is always the secondary company.

Resolution for Issue 'How do I make a company primary or secondary?' available: Yes (Solved).
Source: Intuit Community forum.

How do I make a company primary or secondary?: 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.

Support for Accountant
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