Hey @alex.ionic Racheal from the support engineer team here 

Just as a heads up, since you're using a third party that's not supported by us we're going to be very limited in how much insight we can provide here, as we just don’t have the knowledge of capacitor. For context, other customers have faced significant issues with it in the past that we didn't have the resources to help troubleshoot with- typically reaching out to their support team will be more helpful!

If you are able to, I’d suggest following our iOS docs here to properly register the device token and see if that fixes things for you!