QB Issue Resolution:

They differ by product year. Make sure you are actually launching the correct version of the QuickBooks software.

Resolution for Issue 'Why doesn’t the product code sent in the confirmation email keep coming up as invalid when I try to register this product?' available: Yes (Solved).
Source: Intuit Community forum.

Why doesn’t the product code sent in the confirmation email keep coming up as invalid when I try to register this product?: 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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