We have implemented OWA access to an Exchange 2013 server on-premise using Azure AD Application Proxy \ conditional access to check the box for MFA access. However, if we disable our firewall rules for outside to inside access for our Exchange server, we break outlook anywhere and active sync. Has anyone found a way to implement outlook anywhere and ActiveSync through azure application proxy so we can fully remove our outside access rule on our firewall to exchange?
I have seen some older articles state Microsoft does not support this, but people have found a way to do it. There is no documentation on how it was done. Also, maybe Microsoft has found a supported way to do this since other people have asked.