@Wayne-TP Thanks for your response! Does you reply mean that the behavior of the Tapo D235 is working like this by design? My scenario is for the second notification in a minute on my iPhone is...

I do get a notification much later (1 or 2 minutes later): TIME SENSITIVE Doorbell Ring Missed: You have missed a doorbell ring.

Problem: Every time when I press the D235 Doorbell more than once in the same minute, I only get a notification (or call) on my iPhone. So only after the first press, I get notification/call...