Lync Mobility: E_AuthError E2-3-2


Lync Mobile Client won’t sign in.
Mobile client logs contain the error E_AuthError E2-3-2
Tests from are successful.

If the tests from are unsuccessful then you may need to recheck the user credentials

Reviewing the logs from the mobile device you find the following error messages:-

  • 401 – Unauthorized: Access is denied due to invalid credentials.
  • You do not have permission to view this directory or page using the credentials that you supplied.
  • Received webticket resposne with status E_AuthError (E2-3-2)
  • Mapping error code = 0x22030002
  • Mapped error message is ‘We can’t sign you in. Please check your account info and try again.

Clearly there is some issue with your credentials.

If you go back to the  site you will recall being prompted for Domain\User Name (or UPN)

Skype Mobile Connectivity failure

Cause and Resolution

The issue is that the mobile client does not require or prompt the user for the Domain\User Name (or UPN). The field is actually a little hidden and thus often overlooked. You can find it in Show Advanced Options.

Lync 2013 Mobile ApplicationWindows mobile Lync 2013 mobile UPN


If you enable UPN Naming for the user account and the SIP address is also the UPN address then the mobile user does not need to provide the User Name in Advanced options.


About Paul B

My name is Paul Bloem and I am employed at Lexel Systems in New Zealand as a Principal Consultant for Unified Communications. I have been working on enterprise voice solutions for over 20 years. My first 10 years were spent working for a Telco in South Africa (Telcom SA). This is where all the groundwork happened as I was exposed to just about every aspect of telecommunication you could imagine. I develop an interest in PBX technologies and eventually became the go-to guy. Next, I had a 10 year run at Siemens South Africa, most of my time there was as a Technical Trainer. During this time VoIP hit the world stage, I had the privilege of introducing VoIP both as H.323 and later SIP across the Siemens HiPath 4000 solution stack. In 2008 I immigrated to New Zealand with my newly attained MCSE, I was ready to go where no PBX Techie had gone before. I was employed to explore OCS 2007 and that was pretty much the beginning of the end for me. I have been working on OCS and Lync ever since. My current role focuses exclusively on Lync and associated technologies.. That includes pre-sales, consulting, architecture and design, training and support. I even get to play in the development space from time to time - focus on play ;-) I was nominated as a Microsoft VTSP for Lync early in 2013 and also awarded Microsoft's MVP award for Lync in 2014.
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