Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello,
One thing to clarify is that the Purchase History section often only shows items bought directly from the Microsoft Store, while retail licenses show up under a specific Services & Subscriptions tab.
Have you checked that specific tab on the account dashboard yet?
If the license is not there, it is almost certain that a different Microsoft account was used to redeem the code initially, as these licenses are permanently bound to the original account and cannot be moved or detached.
Do you have any other email addresses you might have used when you first set up Office on the old MacBook?