This article provides a solution for the "ACCOUNT IS NOT VERIFIED" error in Office 365. After following the steps in this article, this issue will be resolved until your next sign-in.
Step 1.
Close all Office applications if they are running (Word, PowerPoint, Outlook, Excel, Skype, or Teams).
Step 2.
Open Word and create a blank document.
Step 3.
Close Word again without saving the document.
Step 4.
Next, launch Outlook, and the message should now be gone. You can also try launching Word or Skype to test this.
The message "ACCOUNT HAS NOT BEEN VERIFIED" should now be gone.