To fix this issue, install the January 2019 cumulative update. In addition, as the on-premises mailboxes are local resource, the Autodiscover process works fine. As the Exchange on-premises servers can't directly connect to Exchange Online, the connection fails. The issue occurs because the Exchange CAS server is redirecting the Autodiscover request to Exchange Online directly instead of using the proxy server. In addition, the on-premises users won't be affected. In this scenario, the user of the account can't use the feature of server-side conversation history to save the conversation history in the Exchange online mailbox. You set up an account by creating an Exchange online mailbox. You enable the server-side conversation history feature by using the conversation history configuration settings for Skype for Business. You set up the Skype for Business Server OAuth configuration settings (-ExchangeAutodiscoverUrl-) pointing to your on-premises Exchange CAS server. You implement the Skype for Business Server 2015 Front-End pools with the proxy and without a direct access to the Internet. You are in a Microsoft Skype for Business Server 2015 on-premises and Exchange hybrid environment.
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