QB Issue Resolution:

This error code (3371) caused by missing or damaged files. To fix this issue, rename the EntitlementDataStore.ecml by adding the word old after the file name. The instructions can be found on this hyperlink: Re-create damaged EntitlementDataStore.ecml

Resolution for Issue 'I am getting an error code 3371 while attempting to open quickbooks' available: Yes (Solved).
Source: Intuit Community forum.

I am getting an error code 3371 while attempting to open quickbooks: 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.

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