mobile client and logon problem

I've install the ManageEngineServiceDesk Plus app from Play store on my android phone. I've inserted my ip for my server and I'm trying to logon. But I get "Login Failed" - User authentication failed. I know my password is correct. I think it's related to the same fact when I'm trying to logon to the web, I have to spesify that I'm not using domain, but local authentication.

I can't figure out what to type in front of my user name to force it to use local authentication. Could anyone please tell me how I can logon through the app on my phone?

Regards, Lars