@mac10 You don't need an NVR, if i connect the doorbell to my router it just works and i got notifications on the mobile app. My problem was that when I connected the doorbell via my NVR the notifications stopped working. This issue was fixed using the new firmware.

On Twitter i got this response:

Hi Henny, you will need to upgrade your NVR with the latest firmware here, https://bit.ly/3zNx83Z. You are running a rather old firmware on your NVR, which doesn't support the doorbell and its smart features.
Also, make sure that the Android app is updated to ver. 4.35 or above.

After I manually upgraded the NVR the doorbell is working properly. I thought that I was running the latest firmware because the NVR said so when I checked for new updates. But on the site above a new firmware was available...

Same issue here:
RLN8-410, hardware N3MB01, firmware v3.0.0.173_22041117
Doorbell acts as a camera only and i get no notificatons on my android app.
Can anyone from Reolink please clarify what causes this issue and when it will be resolved?