Microsoft has made a temporary adjustment to Office document behavior within Microsoft Teams which requires an additional step in order to edit a document. This is a change from current behavior that allows users to go straight to edit mode when clicking on a document in the "Files" tab of a channel, a conversation, or from inside an assignment.
Now, upon clicking on the document, users will first see the document in view mode. Users will be able to see the document content, but not make changes.
In order to edit the document, users need to click on the options in the top right of the white bar above the document content and select "Open in Browser" or (for users with Office for Windows installed on their device) "Open in Desktop App". This will open the document in Office in a separate window from Teams and allow the user to make changes.
If you have any questions please contact the OIT Service Desk: https://oit.duke.edu/help
For more information about Microsoft Teams visit OIT's web page: https://oit.duke.edu/what-we-do/applications/office-365-microsoft-teams