Push Notification only work on 1 user or device

I’m currently working on an internal app for my team. I’m using the push notification feature, but unfortunately, it only sends notifications to one user or one device. All notification permissions on the user’s phone are granted. Still, they can’t receive notifications. It seems like notifications are only being received by one user or device.

Can anyone help with this issue?

Push notifications feature was moved back to beta because it is not reliable.