NDEF push

Hello,

I just recieved the BenQ T80 mobile phone and I am playing with the nfc part of it.
I am trying to add the following line to the jad file of my java aplication:
MIDlet-Push-1: ndef:external_rtd?name=urn:nfc:ext:mydomain.com:myExtension,myMidlet,*
When i dowload the midlet form the internet, it downloads noramaly, but when it starts to
install the mislet, I get an error: Installation failed, errno=911 Push registration failed
The push registry line works fine with nokia 6131 NFC, but not with the Benq T80.  
What is wrong?

Samo