Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi, You should be able to use your work email address to obtain your Office 2013: Microsoft Home Use Program - Order History
See Q&As below "If you purchased Office Professional Plus 2013/2016/2019, Office Home & Business for Mac 2016/2019, Visio Professional 2013/2016/2019, or Project Professional 2013/2016/2019 prior to November 30,2018, you can use the field above to request your installation information and product key(s). To do so, enter the work email address you previously used to make a purchase. Once submitted, we’ll confirm your purchase and send your installation link and product key to the email address you entered. Please note that you must still work at the same company from which you received the Home Use Program discount."