Using classic Outlook for Windows in business environments
You can refer to the AI's suggestions first. If your current Outlook build is 20026.20182 or higher, you might be encountering a known issue that can cause Copilot to disappear from Classic Outlook. To work around the issue, you may consider:
Using New Outlook or Outlook Web Access (OWA) or creating a new Outlook profile.
In addition, you can try to enable the Show Apps in Outlook feature:
Select File > Options> Advanced.
Under Outlook panes, check the box for Show Apps in Outlook.
Reference: Copilot buttons are missing in classic Outlook for Windows
Additionally, you could ask your current administrator to verify the following:
Verify that your Microsoft 365 Copilot license is correctly assigned to your account.
Check that your account is properly configured and eligible for Copilot.
Reassign the Copilot license to your account if necessary and then restart all Microsoft 365 apps.
To ensure I fully understand your situation and provide the most effective assistance, I'll need a few additional details:
Could you let me know if the behavior started after any recent changes, or did it occur unexpectedly?
May I know which Microsoft 365 license is currently assigned to your account and your current Outlook build version?
Any updates would be appreciated.