QB Issue Resolution:

Intuit is usually very loathe to allow you to transfer/sell a license unless (1) your business has been sold and the sale includes the software license(s) or (2) you donate it to a non-profit.

Either way, you must fill out a form and submit it along with a fee to Intuit then wait to see what they say.

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

Details:    https://www.intuitiveaccountant.com/people-and-business/what-if-i-want-to-sell-my-quickbooks-softwar…

Resolution for Issue 'Transferring a QuickBooks for Mac 2016 License?' available: Yes (Solved).
Source: Intuit Community forum.

Transferring a QuickBooks for Mac 2016 License?: 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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