QB Issue Resolution:

Before we re-install QuickBooks, would you mind to give it a try to follow the steps provided on this link : Re-create damaged EntitlementDataStore.ecml

Resolution for Issue 'I can’t open QB due to error3371, status code-1. I will try to reinstall QB. How can I backup the data I already made before reinstalling?' available: Yes (Solved).
Source: Intuit Community forum.

I can’t open QB due to error3371, status code-1. I will try to reinstall QB. How can I backup the data I already made before reinstalling?: 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 back up
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Error Recovery for back up [Canada]
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