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Delegate Mail Account Misconfiguration Issue in ios outlook

shaheen shaik 5 Reputation points
2025-07-28T14:27:44.3033333+00:00

Hi Support Team, We are encountering an issue with a user (******@xxx.com)who is unable to add a delegate mail account in the Outlook ios mobile app on his iPhone. Although the account initially appears to be added, a misconfiguration error surfaces after some time. Please find the attached screenshot of the error message. The device is enrolled correctly, and we have already tried the following troubleshooting steps: Unenrolled and re-enrolled the device Uninstalled and reinstalled the Outlook app Signed out and signed back into the Outlook account Despite these efforts, the issue persists.providing a resolution. Please let us know if you require any further informationWe would appreciate your assistance in identifying the root cause and providing a resolution.

Outlook | Outlook for mobile | Outlook for iOS | For business
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  1. Liora D 2,570 Reputation points Microsoft External Staff Moderator
    2025-07-28T14:59:43.6766667+00:00

    Hi @shaheen shaik

    Thank you for contacting Microsoft Q&A Support and for sharing the details. 
     

    Recommended Steps to Resolve Misconfiguration Alert 

    1. Check IntuneMAMUPN Configuration 

    Outlook for iOS relies on the IntuneMAMUPN setting to identify the managed user account. If this value doesn’t match the actual login used in Outlook, it can trigger misconfiguration errors. 

    • Ask your Intune admin to verify the App Configuration Policy for Outlook iOS. 
    • Ensure the IntuneMAMUPN value matches the user's UPN (e.g. ******@domain.com). 

    How to configure Outlook for iOS with Intune: Deploying Outlook for iOS and Android app configuration settings in Exchange Online | Microsoft Learn 

     

    2. Remove Old Device Profiles 

    Sometimes, leftover MDM profiles or previous enrollments can interfere with Outlook’s configuration. 

    • On the iPhone, go to Settings > General > VPN & Device Management 
    • Remove any outdated or conflicting profiles 
    • Also check Microsoft Entra to ensure the device isn’t listed under previous enrollments

    3. Deploy Outlook via Intune 

    If Outlook was installed manually from the App Store, try deploying it via Intune instead. This ensures the app receives the correct configuration and policies during installation. 

    4. Verify Delegate Mailbox Permissions 

    Make sure the user has the correct permissions for the delegate mailbox: 

    • Full Access 
    • Send As or Send on Behalf 

    Also confirm the mailbox type (shared mailbox, user mailbox, etc.) is supported on Outlook for iOS. 

     

    5. Try Offloading the App 

    Some users have resolved misconfiguration issues by offloading the app instead of uninstalling it: 

    • Go to Settings > iPhone Storage > Outlook 
    • Tap Offload App, then reinstall 

    This clears cached data while preserving app settings. 

     
    If the error continues after trying these steps, could you please share the screenshot of the error message you mentioned? It wasn’t attached to the post, but it would help us better understand the exact nature of the misconfiguration. 

     

    If you need any further assistance or have additional questions, please don’t hesitate to reach out. I'm here to help. 

    Thank you again for your patience and for choosing Microsoft Q&A forum. 

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".   

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.  

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