cannot register forticlient iOS

Hi,

I have two iOS devices, an iPhone 5 and iPhone 6, both running iOS 9.1.  In the fortiwifi 60D I have enabled endpoint registration with a key.  

I downloaded Forticlient iOS from the app store, installed it on the iPhone 5, enabled the endpoint control, got the login screen to enter the key and all is fine.

I do exactly the same thing on the iPhone 6 afterwards but it does not ask for the key it just asks for the registration at 10.0.1.1:8010 and when I enter ok it keeps on asking over and over again without succeeding.  Status remains 'searching' ....

I do not see any failed attempts in the log files.

Any ideas ?