Copilot in Outlook iOS Missing Summarize Button: Fix

You open an email in Outlook on your iPhone or iPad and expect to see the Copilot Summarize button. Instead, the button is grayed out or completely missing. This problem usually occurs because your Microsoft 365 license lacks the Copilot feature, or because the app version does not support the button yet. This article explains why the Summarize button disappears and provides the exact steps to restore it.

Why the Copilot Summarize Button Disappears in Outlook iOS

The Copilot Summarize button in Outlook for iOS relies on three components working together. First, your Microsoft 365 tenant must have Copilot for Microsoft 365 enabled and assigned to your user account. Second, the Outlook iOS app must be version 4.2430 or later because earlier builds do not include the Summarize feature. Third, the mail account you are using must be a work or school account that is authenticated with Microsoft Entra ID. If any of these conditions are not met, the button either appears grayed out or does not appear at all.

A common scenario is that the tenant administrator has not assigned Copilot licenses to all users. Another frequent cause is that the user is signed into Outlook with a personal Microsoft account instead of the work account. The app itself may also be outdated, missing the code that renders the Summarize button. In rare cases, the Exchange Online mailbox policy blocks Copilot features for security reasons.

License Assignment and Tenant Policy

The Copilot for Microsoft 365 license must be assigned to your specific user account. Even if your organization owns Copilot licenses, an administrator must allocate one to you through the Microsoft 365 admin center. Without this assignment, the Outlook app cannot activate the Summarize function. Additionally, the tenant administrator may have disabled Copilot for certain users or groups via conditional access policies.

App Version and Account Type

Outlook for iOS version 4.2430 is the minimum required for the Summarize button. You can check your app version by opening the App Store, tapping your profile icon, and scrolling to the Outlook entry. The account you use must be a Microsoft 365 work or school account. Personal Outlook.com, Gmail, or iCloud accounts do not support Copilot features.

Steps to Fix the Missing Summarize Button

Follow these steps in order. After each step, restart Outlook and check if the Summarize button appears when you open an email message.

1. Verify your Copilot license assignment
   Open a web browser and go to the Microsoft 365 admin center at admin.microsoft.com. Sign in with your administrator account. Go to Users > Active users, select your user account, and click the Licenses and Apps tab. Confirm that Copilot for Microsoft 365 shows a check mark. If it does not, click Edit, select the Copilot for Microsoft 365 license, and save.
2. Update Outlook for iOS to the latest version
   Open the App Store on your iPhone or iPad. Tap your profile icon in the top-right corner. Scroll to the Available Updates section. Find Outlook and tap Update if an update is available. If the update is not listed, Outlook is already current. The Summarize button requires version 4.2430 or later. After updating, open Outlook and sign out and back in.
3. Set your work or school account as the default
   In Outlook for iOS, tap your profile icon in the top-left corner. Tap the gear icon to open Settings. Tap Mail Accounts. Under Default Account, select your work or school account. If you only have one account, it is already the default. Close Settings and open any email message to test the Summarize button.
4. Remove and re-add your work account
   If the button still does not appear, remove the account and add it again. In Outlook Settings, tap Mail Accounts. Tap the work account, then tap Delete Account. Confirm the deletion. Go back to Settings, tap Add Account, and select Work or School. Sign in with your Microsoft 365 credentials. After the account is added, open a message and check for the Summarize button.
5. Check Exchange Online mailbox policy
   Contact your Microsoft 365 administrator. Ask them to run the following PowerShell command in Exchange Online: Get-Mailbox -Identity "your-email" | fl copilot. If the property CopilotEnabled is set to $false, the administrator must run Set-Mailbox -Identity "your-email" -CopilotEnabled $true.

If Copilot Still Has Issues After the Main Fix

If you completed all steps above and the Summarize button is still missing, check for these additional problems.

The Summarize Button Is Grayed Out

A grayed-out button means the feature is recognized but cannot be activated. This often happens when the selected email is too short. Copilot requires at least 100 characters of body text to generate a summary. Try opening a longer email from your inbox. Also, ensure the email is not encrypted or protected with information rights management IRM. Copilot cannot summarize IRM-protected messages.

Copilot Does Not Appear in Any Email

If the button is missing from all emails, the Outlook app may be using cached data that hides the feature. Force close the app: on an iPhone with Face ID, swipe up from the bottom and pause, then swipe the Outlook card off the screen. On an iPhone with a Home button, double-click the Home button and swipe Outlook away. Reopen Outlook and sign in again. If the problem persists, reinstall the app from the App Store.

Copilot Works on Desktop but Not on iOS

This indicates that your license and account are correct, but the iOS app is not syncing the feature state. Go to Outlook Settings > Notifications and ensure notifications are enabled. Then go to Settings > Mail Accounts and tap your work account. Tap Fetch New Data and set it to Push. This forces the app to sync the latest mailbox configuration, including Copilot availability.

Item	Outlook for iOS	Outlook for Desktop
Minimum version for Summarize	4.2430	Version 2402 Build 16.0.17328
Account type required	Work or school M365	Work or school M365
License requirement	Copilot for M365	Copilot for M365
IRM-protected email support	Not supported	Not supported
Short email minimum length	100 characters	100 characters

After following the steps above, the Copilot Summarize button should appear when you open any email message that meets the length and protection requirements. If the button remains missing, ask your administrator to verify the tenant-wide Copilot setting in the Microsoft 365 admin center under Settings > Org settings > Copilot. The toggle for Copilot must be enabled. Once everything is configured correctly, you can use the Summarize button to quickly generate a bullet-point summary of long email threads directly on your iPhone or iPad.