QB Issue Resolution:
You can cancel the Company file (the one in question) from the list by logging in to the file and cancel the service or subscription. Go to Gear > Your Account > Cancel the Service
Resolution for Issue 'How to Delete a Company in QBO?' available: Yes (Solved).
Source: Intuit Community forum.
How to Delete a Company in QBO?: 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 Delete company QBO
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Error Recovery for Delete company QBO [Canada]
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