office Remote turns your phone into a smart remote that interacts with Microsoft Office on your PC. office.com/setup
The app lets you control Word, Excel, and PowerPoint from across the room, so you can walk around freely during presentations. You will use your Microsoft account for everything you do with Office . office.com/myaccount
If you use a Microsoft service, such as Outlook.com, OneDrive, Xbox Live, or Skype, you already have an account.
Be more innovative and accomplish what is important with Outlook, OneDrive, Word, Excel, PowerPoint, OneNote, SharePoint, Microsoft Teams, Yammer, and that's only the tip. www.office.com/myaccount
For more details go through the links: Log in with Microsoft Account using Id and password associated with the copy of MS office you have bought office.com/setup
Setup Office 365/2019.