Thanks,
We have checked that the problem is in a previous step, in the selection of the audience. We have selected the only Mobile Application that we have configurated and when we click in "Count" without including any other filter, we get "Zero" so the delivery doesn't have any record to deliver. It is as if there were no records in the environment to send through the push channel
But, if we access to Administration > Channel > Mobile app (AEP SDK) to the only mobile application that we have configured, we have records in "Mobile application subscriber" so we expected the number not to be "zero":
Thanks