Prtg app


I am trying to get the PRTG App up and running but i have problems logging into my user when adding a new PRTG unit. I have my username, my ip and 443 port and the passphrase - but it can not login. I must be overlooking something or does tha APP not work anymore?
Has anybody used this app - perhabs there are other things that need to be made in order to log in?