I have a business requirement to allow SharePoint 2016 Site reachable from iOS/Android SharePoint Mobile Application. I have setup a new Web App and extended and published it over the internet, I can open the Web Page just fine from any device including browsers in the mobile phone. However, when I attempt to connect to the service via the Mobile App, I am able to authenticate using NTLM authentication, however all I see is a blank loading page.
Is there any recommended way to implement SharePoint Web App so it is useable from the mobile app? Also I have read that the application only supports NTLM and FBA authentication, have any of you tried to implement FBA with multifactor authentication and used it with the app?
Will be grateful for any response, thank you.