Microsoft has fixed a known issue causing the Copilot Chat or Copilot buttons in Classic Outlook to disappear for Windows users with the Copilot Chat (Basic) license.
As the company explains in a recent support document, affected users may no longer see Copilot buttons on the side navigation and above the ribbon.
Those affected may also experience one or more of the following issues:
The Copilot button is missing from the top-right area above the ribbon.
The Copilot icon is missing from the left app bar or More Apps area in classic Outlook.
