Issues with iPhone App

Issues with iPhone App

Through the website everything works as well as with the android app. Using the Iphone app I hit "Account Unlock" and enter my Username with Domain
Domain\username
and get "invalid loginname or you are required to enroll to use this service"

As I said: With the android app or the websites it works perfectly.
Any idea?
                New to ADManager Plus?

                  New to ADSelfService Plus?