A real hand-banger of an issue thanks to Microsoft’s love for hiding settings behind classic admin centers. After enabling Office for Web and OneDrive (or Sharepoint) for several users, they were unable to edit Office documents in Office Online / Office Web Apps via www.office.com. They didn’t even show up!
What Was Being Seen:
What Should Be Seen:
The resolution was classic Microsoft. After making sure that the users had the correct applications assigned, namely Office Apps for Web and either SharePoint or OneDrive, we had to navigate to the SharePoint Admin Center, click on Settings, and then classic settings.
Once there, the first option was the cause of our trouble. Make sure you don’t hide the icons!