Lync 2013 client (using Office 365 server) fails to access the Exchange calendar on Windows Phone 8 (Lumia 920) and locks the AD account RRS feed

  • Question

  • Here is our weird situation:

    - we have Office 365 in Hybrid Setup (we use ADFS and DirSync) - some of the user mailboxes are already moved to Exchange Online but most of them are still on premises with Exchange 2010 SP3

    - we use Lync 2013 client on our computers, Android, iOS and Windows Phone 8 devices - the server is in the cloud

    - when the mobile device is on the company network (Wi-Fi or via VPN) the Lync client can access the user's calendar (can reach the Exchange server) but when the device is on a 3G/4G/LTE (no VPN) connection the Lync client fails with the following error:

    This is the error when the Android device is NOT on the company network

    - if this is an Android or iOS device you just ignore it and keep using the Lync client without accessing your Calendar

    - one of our VPs has a Windows Phone 8 device and when he gets the error his AD account gets locked out

    - this makes Lync unusable on his phone and we really have to find a solution for the issue.

    Additional details:

    - I already ran the Exchange Web Services sync, notification, availability and autoreplies test for Office 365 on   https://testconnectivity.microsoft.com/   and the result comes green

    - when the VP gets the error on his phone this counts as 2 bad password attempts, within a minute the attempts become 5 and his account gets locked

    I am not sure what other test to run or which setting to check (via PowerShell, on-premises Exchange Management Console or in the cloud EAC) - any help would be appreciated.

    Wednesday, November 27, 2013 2:16 PM


  • Hi,

    Please verify if other EWS feature work properly on mobile.

    If not, you may need to focus on EWS issue as UC clients and devices will only use the DNS-based discovery method. The Autodiscover process is initiated one minute after the client successfully authenticates to a Lync Registrar server. Please make sure the DNS record can be accessible from UC devices.

    If the issue persists, I recommended you also post the issue on Office365 forum to get further information as this forum is  for Lync Server On-Premise only. Thank you for your understanding.


    Kent Huang
    TechNet Community Support

    • Marked as answer by Kent-Huang Sunday, December 8, 2013 9:10 AM
    Thursday, November 28, 2013 6:38 AM