Forum Discussion
Publishing Exchange 2016 OWA through Azure AD App Proxy
Dear community, We are starting some tests for publishing on-premises Exchange 2016 Outlook Web Access through Azure AD Application Proxy and everything seems to be working fine from the Azure AD...
I would recommend looking at this blog post from Mike Parker: https://mikeparker365.wordpress.com/2018/09/17/how-to-secure-exchange-2016-with-azure-ad-part-1-authenticating-owa-with-kerberos/. He explains how to implement Hybrid Modern Authentication and how to publish OWA through an Application Proxy. Maybe it will provide a himt as to the cause of your issue.