How do I sign into the Office desktop apps like Word, Excel, or Power Point using my Office 365 Account credentials?

For Office 2016 to work you must be signed into one of the applications (Word, Excel, PowerPoint, Etc) with your Office 365 credentials.

Sign in to Office from an application

You can sign in to Office from the application window, or the information section of an app.

Sign in from the File menu   

1. Open an app, such as Word or Excel, and then open an existing file, or create a new one.
2. Select File > Account (or Office Account if you're using Outlook). If you're not already signed in, click Sign In.

   

3. In the Sign in window, type the email address and password you use with Office. This might be the personal Microsoft account you associated with Office, or the username and password you use with your work or school account. Click Next.