Try the additional steps outlined in this article:

https://community.intuit.com/articles/1580977-error-6000-83-an-error-occurred

Resolution for 'additional steps issue: 'One of my users cannot open the company file. The error code is -6000, -83.' available: Yes.

The additional steps 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 additional steps issue yourself by looking for a resolution described in the article. If it is a complex additional steps issue or you are unable to solve the issue, you may contact us by clicking here or by using other additional steps support options.

For more information about resolving issues related to additional steps in Quickbooks/QBO or to get support for the issue 'One of my users cannot open the company file. The error code is -6000, -83.', click the link below: