I have the newest HDP 2.4 with Ambari 188.8.131.52 and created a ambari admin user named "Daniel" while logged into Ambari with admin.
Admin can login just fine - however any user I created will not get a reaction after clicking on the login button...
Also: as admin I can't change user accounts (names, etc.) - it just stays blank if I am not editing my own (logged in) user.
What's up with that?
I found the answer myself... Users like "Daniel", "Test_01", etc. are not possible and sign-in will fail. We need to use lowercase only!
Please fix this bug!