QB Issue Resolution:

Yes , It looks like it was fixed in R31. https://community.intuit.com/articles/1760165 Again, thanks for bringing it to our attention. we couldn’t have done it without you. ~B

Resolution for Issue 'is quickbooks 2016 compatible with Mojave' available: Yes (Solved).
Source: Intuit Community forum.

is quickbooks 2016 compatible with Mojave: 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 Mojave
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Error Recovery for Mojave [Canada]
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