I have verified that the device tokens are correct. I am also able to send push notification to the same device using the “One-time Notification” from https://apps.ionic.io
Have you made sure the ios certificates/provisioning profiles are all up to scratch and setup? If you’re sending it to android, the GCM needs to be setup with the correct project number too.
before testing on an actual device, be sure that all your tests are successful and working during debug mode. If it’s not then you’ve made a hiccup with your coding somewhere.
remember to set debug to false when sending notifications to devices.