We noticed this issue when running our OperationsTest against the CST-IoT-service, the provider connects up just fine, so does the requestor, and all operations are successful. The dof logging output though seems confusing and doesn't make sense. It prints out :

(DOFLevel 1): DOF: Permission to use sid is unknown, trying to extend permissions.

This log output seems correct, since our test extends permissions, but then just before sending interest it prints out:

(DOFLevel 16): DOF: EEP V2: Permission to use sid is denied, therefore cannot send.

As mentioned above, all the operations are successful and the test completes just fine. So I'm not for sure what couldn't be sent.