QB Issue Resolution:

unless you have a multi user license, QB only installs on 2 computers, for personal use

if you have a multi user license, have you exceeded the number of users – 30 I think for enterprise

when you enter the registration numbers, are just entering the numbers, do not tab to the next field QB will do it for you

Resolution for Issue 'Product number is incorrect' available: Yes (Solved).
Source: Intuit Community forum.

Product number is incorrect: 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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