Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
On an Android device, you can't run a perpetual version of Office; that is correct. You will need a subscription. Note that even with a subscription (such as Microsoft 365 Personal), functionality is limited on a mobile device compared to what you can do in the Office apps on a PC or Mac. See https://support.microsoft.com/en-us/office/what-you-can-do-in-the-microsoft-365-apps-on-mobile-devices-with-a-microsoft-365-subscription-9ef8b63a-05fd-4f9c-bac5-29da046833ea .