maybe i don't have a clue about what i am talking about but im trying read the profilematic code ( i know almost nothing about qt or C++ ) and reading the API and i don't se where you set the enum property of targetaccessmode something like:

public:
enum TargetAccessMode {
NoTargetAccess = QNearFieldManager::NoTargetAccess,
NdefReadTargetAccess = QNearFieldManager::NdefReadTargetAccess,
NdefWriteTargetAccess = QNearFieldManager::NdefWriteTargetAccess

where QNearFieldManager::NoTargetAccess is
"The application cannot access NFC capabilities."
so don't try/fire the notification error about not know how handle the tag content.