I launched an ownCloud instance on AWS using the TKL DDNS service.  Most everything worked fine. I can access it from a browser, can add apps, add users and do all that needs to be done.  In addition, the desktop sync client (Windows 7) works just fine.  I then tried the iOS app.  The user "admin" is able to connect via the app without issue.  However, any other user I try, is not able.  I get the error "unable to connect at this time" or whatever.  I cannot figure out why one user can successfully connect while the other cannot.  Any ideas or suggestions?