Recently I've set up Exchange Server 2016, configured external DNS accrodingly. Server itself works fine, can send and receive emails. OWA is working fine aswell (externally and internally).
Issue is that Autodiscover is not working properly. I can open it externally via https://example.com/autodiscover/autodiscover.xml (it prompts for user and password), but cant set up an account automatically in Outlook. Outlook prompts for server address and domain credentials. I have no problem typing those, but I need to solve this issue due users.
When testing Autodiscover in Microsoft Connectivity Analyzer it reports no errors whatsoever.