Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Which Office products are listed in Installed Apps in Windows Settings? If you see more than one product there, uninstall the one you do not want to use.
As you are probably already know, subscriptions are typically called "Microsoft 365" while any one-time payment versions are called "Office." There may be a language description, such as "en-us" appended to the product name as well.