A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
1
Open Word, then go to File - Account.
ON that window, do you see the Email associated to the Microsoft account used for the Office licence?
2
Is it possible you have more than one Microsoft account, if so, log into any Microsoft account you may have on this link (https://account.microsoft.com/services/), do you find your Office licence listed there, if not, click Billing on the left, are you able to find the purchase details of that perpetual Office licence listed there.