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Users can't sign in to Lync Mobile on Apple iOS-based devices because of certificate errors

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PROBLEM

You are connected to a corporate wireless (also known as Wi-Fi) network or are signed in to an Office 365 subscription that's enabled for single sign-on (SSO) by using Active Directory Federation Services (AD FS) 2.0. When you try to sign in to Lync Mobile on your Apple iOS-based device (such as an iPhone or iPad), you receive one of the following error messages:
  • Can't verify the certificate from the server. Please contact your support team.
  • Can't connect to the server. It might be unavailable. Also please check your network connection, sign-in address and server addresses.
In addition, when you view the Lync Mobile logs for iOS, you see the following entry:
Lync[13886:300b] ERROR TRANSPORT
/Users/comobuildadmin/icomo/private/se_wave1_idx/src/dev/CoMo/transport/_buildIos/../liveId
/private/CLiveIdUtilities.cpp/155:Converting liveIdError -2147012841 to ErrorCode 570556418

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SOLUTION

To resolve this issue, install your Enterprise Root CA Certificate on the iOS Device. You can do this manually or by using the Apple Configurator.

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MORE INFORMATION

The cause of each message is slightly different, but both errors are caused by the inability to verify the authenticity of a certificate or certification authority.

For more information, go to the following Apple website:
Digital certificates - iOS Deployment Reference
Or, contact Apple Enterprise Support for help with managing your iOS devices.

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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Still need help? Go to Microsoft Community.

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Article Info
Article ID : 2773530
Revision : 3
Created on : 8/20/2020
Published on : 8/21/2020
Exists online : False
Views : 314