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 'company primary issue: 'How do I make a company primary or secondary?' available: Yes.
The company primary 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 company primary issue yourself by looking for a resolution described in the article. If it is a complex company primary issue or you are unable to solve the issue, you may contact us by clicking here or by using other company primary support options.
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