If you previously installed a trial version of Office 365, it may conflict with your Office 2016 license.
Office 365 (now rebranded as Microsoft 365) is a . You pay a monthly or annual fee. In exchange, you always have the latest version of Office (currently 2021/365 editions), extra cloud storage on OneDrive, and the ability to install it on multiple devices. You activate it by signing in with an email and password associated with a subscription. activar office 365 2016