Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
If you previously had Microsoft 365 or a digital Office license on your laptop, you not need the original product key. The license may be linked to your Microsoft account.
First, sign in with the Microsoft account you previously used for Office and check your services here:
https://account.microsoft.com/services
If your Microsoft 365 subscription or Office license appears there, you can install Office again and activate it by signing in with that account.
You can follow these steps;
https://support.microsoft.com/en-us/office/lifecycle/officeinstall/download-install-or-reinstall-microsoft-365-or-office-2024-on-a-pc-or-mac