Go to your Microsoft account dashboard and if you're not already signed in, select Sign in.
Third-party seller: You bought Microsoft 365 from a third-party and you're having problems with the product key. Some organizations have different methods to install Microsoft 365 on multiple devices. Volume license versions: If you work in an organization that manages your installations, you might need to talk to your IT department. Microsoft Workplace Discount Program (formerly known as Home Use Program): If you bought Microsoft 365 for personal use through your company, see Install Office through Workplace Discount Program.
Note: The steps to install the 2019, 2016, or 2013 versions of Office Professional Plus, Office Standard, or a stand-alone app such as Word or Project might be different if you got Microsoft 365 through one of the following:
