Currently it is not possible to add Mapping, Authentication or Authorization Module to Security Domains (security subsystem) unless a module was previously added through the cli -- after that more modules can be added in console without any further complications.  

Usually there is no error message at all, occasionally message like this is delivered by console  "Success: write-attribute login-modules: domain123" (message will be obviously different based on module)


Becuase I'm not aware of any debug mode in admin console, which would let me investigate concrete operations executed by it, I'm unable to determine the concrete cause of this behavior.