Hi @Korpyc!
Do you have notifications disabled on your testing device? That’s one reason an invalid token might occur.
Another issue could be that the app is foregrounded (i.e., open on the device) when the notification is delivered. It is best to have the app backgrounded (i.e., closed) and the phone locked when testing if notifications are delivered successfully.
Also, here’s our Help Center article on the topic, if you haven’t already seen it:
If none of the above causes apply, then we can take a deeper look at your integration. I hope this helps get you started!
- Brian