QB Issue Resolution:

try this clean install procedure

https://community.intuit.com/articles/1021037-reinstall-using-a-clean-install

Resolution for Issue 'Why can I not launch quickbooks pro 2019? Why do I get error message 1712 when I try to repair/remove? Why can’t I get online support from QuickBooks on an online chat?' available: Yes (Solved).
Source: Intuit Community forum.

Why can I not launch quickbooks pro 2019? Why do I get error message 1712 when I try to repair/remove? Why can’t I get online support from QuickBooks on an online chat?: 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 online chat
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Error Recovery for online chat [Canada]
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