QB Issue Resolution:

The latest updates are compatible. ┬áJust be sure to upgrade both the server and the client apps. I’d update all of them prior to upgrading to Mojave and I’d recommend updating the server first.

Resolution for Issue 'Is macOS Mojave campatible with QuickBooks 2016 Server R31?' available: Yes (Solved).
Source: Intuit Community forum.

Is macOS Mojave campatible with QuickBooks 2016 Server R31?: 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 macOS
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