Issue with push notifications

Hello - We have a user stating that he is not receiving our push notifications. 

- He has the most updated app version. 
- He has push notifications allowed.
- He has 2 Push Tokens (he has 2 devices), Foreground for both, for the correct app version.
- He is subscribed to push notifications.
- Braze is sending him the push notifications, I see them as "send" on his Messaging History tab.

Everything seems correct on our end, but the user does not receive our pushes?

I run the SDK debugger, and even though he closed the app and relaunched it, the debugger is still in “Waiting for device to connect”. So something is happening with his device, I assume. 

Any ideas on what could I test or what could be happening? I appreciate it!