QB Issue Resolution:

If the company file fails during the verify and rebuild shows unrecoverable error, then it is the file itself that has an issue. I suggest to run the QB File Doctor.

Once done, run verify and rebuild the file 2x. If QB File Doctor would not fix the file issue, the last resort we can do is to send the file to Data Services for file repair.

Resolution for Issue 'Verify data fails, instructs to rebuild. Rebuild fails with unrecoverable error code 16606 52408. Any suggestions?' available: Yes (Solved).
Source: Intuit Community forum.

Verify data fails, instructs to rebuild. Rebuild fails with unrecoverable error code 16606 52408. Any suggestions?: 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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