Lync 2013 on Windows Phone 8 cannot connect to Exchange via TMG

Hi,
I've found that the latest Lync 2013 client on WP8 cannot connect to our Exchange Server 2010 via TMG and the problem is related to autodiscovery. Based on detailed log analysis the symptom is the following:
1. The client is sending a request:
GET
https://autodiscover.neostratus.com/autodiscover/autodiscover.xml
2. It gets a TMG logon form and then tries to POST here:
POST
https://autodiscover.neostratus.com/cookieauth.dll?getlogon?curl=z2fautodiscoverz2fautodiscover.xml&reason=0&formdir=9
<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/requestschema/2006">
<Request><EMailAddress>[email protected]</EMailAddress>
<AcceptableResponseSchema>http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a</AcceptableResponseSchema>
</Request></Autodiscover>
</SentRequest>
The URL is wrong and it fails of course. This is the situation with Lync credentials and manually configured Exchange credentials as well.
Other clients (PC, iOS) can connect fine and all test tools confirm that our autodiscovery setup is correct. I can POST the above XML using basic authentication to the correct URL and get a correct response. And the same autodiscovery process works fine
when setting up an email account on the same WP8 device.
Is this a known WP8 Lync 2013 client bug and is there a workaround?
BR,
Andras

Hi,
The lync client should be able to sing in Lync Server and just lost calendar information if Lync client cannot connect to Exchange. Please double check if the device is able to connect to the EWS URL.
Kent Huang
TechNet Community Support

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