Error message Your Account Doesn't Allow Editing on a Mac - Office 365 Error

After installing Office 365 apps on a personally owned Mac some users get an error that says:

View Only. Your account doesn't allow editing on a Mac. To learn more, contact your admin about your Office plan

First, verify that you are using the proper account: 

1. Click "Use Another Account" and sign in with your email address and Microsoft password
2. Alternately, click the "Activate" button and sign in with credentials.

If that doesn’t work you can try uninstalling office for Mac completely then re-install and re-activate office.  If it is a laptop you can bring it to the Maxwell IT Support Counter ground floor by Starbucks.