Skype for Business Server Side conversation history for Exchange Online users not working

Hello,

I am looking for help with not working Skype for Business Server Side conversation history for Exchange Online users.

Our environment:

• On-premises Skype for Business Server 2015 CU: June 2016
• Hybrid Exchange Server 2016/2010 CU3

Recently I’ve successfully configured OAuth, SSCH and OWA integration for on-prem Exchange and S4B.

OAuth and OWA integration between S4B on-prem and Exchange Online were also configured successfully. Unfortunately, SSCH does not work for some reason, and “Test-CsExStorageConnectivity” fails for Exchange Online users.

Analyzing autodiscover traces of “Test-CsExStorageConnectivity” shows:

• S4B is connecting to on-prem Exchange and is redirected to Exchange Online autodiscover:

2016/12/13 06:18:06.120 Autodiscover.EWSMA trace, type=AutodiscoverResponse, message=<Trace Tag="AutodiscoverResponse" Tid="133" Time="2016-12-13 06:18:06Z">Autodiscover service returned redirection email address 'onlineuser@company.mail.onmicrosoft.com'.</Trace>

• Then, it is redirected to another autodiscover address:

2016/12/13 06:18:06.498 Autodiscover.EWSMA trace, type=AutodiscoverConfiguration, message=<Trace Tag="AutodiscoverConfiguration" Tid="133" Time="2016-12-13 06:18:06Z">Trying to get Autodiscover redirection URL from http://autodiscover.company.mail.onmicrosoft.com/autodiscover/autodiscover.xml.</Trace>

2016/12/13 06:18:06.598 Autodiscover.EWSMA trace, type=AutodiscoverConfiguration, message=<Trace Tag="AutodiscoverConfiguration" Tid="133" Time="2016-12-13 06:18:06Z">Redirection URL found: 'https://autodiscover-s.outlook.com/autodiscover/autodiscover.xml'</Trace>

• And it fails some redirection Url validation:

2016/12/13 06:18:06.598 Autodiscover.Validate Redirection Url, redirectionUrl=https://autodiscover-s.outlook.com/autodiscover/autodiscover.xml, redirectAllowed=False, reason=no match

• After that, it starts autodiscover process two more times and finishes the same way.

Error in the “Test-CsExStorageConnectivity” is:

Test-CsExStorageConnectivity : ExCreateItem exchange operation failed, code=50043, reason=#CTX#{ctx:{traceId:18446744073545522150, activityId:"82a65a8b-629f-413c-be6b-16737f719a51"}}#CTX#Could not get the required ExchangeServiceBinding client, exception=System.ServiceModel.FaultException: #CTX#{ctx:{traceId:18446744073545522150, activityId:"82a65a8b-629f-413c-be6b-16737f719a51"}}#CTX#Could not get the required ExchangeServiceBinding client

Also, in the Event Logs on the FrontEnd server events with ID 32054 are raised:

ExchangeAutodiscoverException: code=ErrorEwsAutodiscover, reason=GetUserSettings failed, smtpAddress=onlineuser@company.com, AutodiscoverUri=https://autodiscover.company.com/autodiscover/autodiscover.svc, Autodiscover WebProxy=<NULL> ---> Microsoft.Exchange.WebServices.Data.AutodiscoverLocalException: The Autodiscover service couldn't be located.

Any help in fixing this issue or additional investigation ideas are appreciated.

Thank you in advance.