Push Notifications - no token returned from registration

I am running into a problem trying to register Push Notifications (iOS). After the registration is accepted, no token is generated. I have tried the following packages:

Expos push notifications (https://docs.expo.io/guides/push-notifications)

All are having the same result - no onRegistration event is fired and no token is returned.

Any help would be greatly appreciated.

I have added Push Notifications feature to Xcode and to our app on app store connect
Using RN 61.5
Using a device (not simulator)