Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
How did you initially install Office? A product as old as Office 2013 will often require that you have both installation media, such as a DVD, and a product key.
On the other hand, if you associated Office 2013 with a Microsoft account, you should be able to install from https://account.microsoft.com/services .
If you need a replacement, consider Office Home & Business 2024 which is a one-time payment license for one computer (PC or Mac) and one user.
Alternatively, try one of the open source alternatives, such as LibreOffice, which creates word processing, spreadsheet and presentation files that are fairly compatible with their Microsoft Office counterparts.