To receive push notifications from a NVR in Wisenet Mobile, firstly create the event rule to send the notification to the NVR:
Add the NVR to Wisent Mobile via the QR code, push notifications will only work when adding the NVR via the QR code.
On Wisenet Mobile ensure notifications are allowed:
Then in Setup, click on alert Setting of Devices
And select the device you want to receive alerts from
There is a also a video showing the process here: