I have a list of few contacts (registered OK after the application installation). I am able to deliver "Inbox" messages OK using a list or a Data Extension (with the same data) containing mentioned Contacts.
I am not able to deliver "Outbound" type of a messages though... The send details indicate that there was "No sendable audience".
Could the problem be that all the related contacts have their "Mobile Push Opt-in status" set to "Opted-out"?
Is it possible to hard-code "Mobile opt-out" into the SDK (device/Contact registration)