QB Issue Resolution:

From your template selection dropdown select edit current template, once in layout designer select  the fields icon at the top left, from the header tab confirm that print is checked at invoice number.

Resolution for Issue 'QUICKBOOKS 2016 MAC' available: Yes (Solved).
Source: Intuit Community forum.

QUICKBOOKS 2016 MAC: 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 Invoice Number
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Error Recovery for Invoice Number [Canada]
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