Issue with push notifications on mobile internet - Xperia Z5 Compact Q&A, Help & Troubleshooting

Hello guys
My girlfriend has an issue with push notifications, when she is using the mobile internet. For example she doesn't receiver WhatsApp messages, as long she is using the mobile internet. She only gets a notification if she opens the app or after she connected her phone to a wifi network.
We wiped her phone and reinstalled Android using the Xperia companion software. The stamina mode is disabled and we set WhatsApp to not optimized inside the battery optimizations.
We have no ideas left, so I hope you have some suggestions how to solve the issue.
Thank you very much!

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