QB Issue Resolution:

Sign on to your Intuit account. You should find it there.

https://camps.intuit.com/app/selfservice/index.html#signin

Resolution for Issue 'How can I get my license and product # to register my product… I no longer have my confirmation e-mail' available: Yes (Solved).
Source: Intuit Community forum.

How can I get my license and product # to register my product… I no longer have my confirmation e-mail: 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 confirmation email
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Error Recovery for confirmation email [Canada]
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Additional Support Options: