No problem. I hope you solve the problem. Can't be sure your issue is the transformer, but certainly that one is not adequate, and if you're sure the wiring is correct, that is probably the problem.
Try another transformer and let us know. :)
That's why I asked IF you installed it. Some people installed it also with the chime installed, it's not needed in that case.
Your transformer is not adequate. 18V 500ma it's 9VA. Usually we recommend an AC 24V 40VA transformer.
18v is not enough information. Post a pic of the transformer's details, we need to know the VA value. Is it an AC or DC transformer? Did you install both the fuse and the power-kit?
Check also all electrical connections one more time.
It's an EZVIZ model. I found some pictures, and they're identical. Plus, I found this video installation tutorial for your model, and if you watch the video, it always references DB1. ;)
That depends on the firmware, and it doesn't provide that functionality, so there's no waiting for news in this thread for that, it depends on EZVIZ/Hikvision not from some tweak or finding.
Not true. We intercept the button press with sensors on the electrical wires since a long time. SAGE doorbell sensor, or Fireflyelectronix doorbell sensor are the ones I personally tried, and they both work fine.
Nope. The RTSP stream is encrypted. In order for other NVR (hw or sw) or systems (Alexa/Google Home) to receive the stream in clear is to disable the option.
Yes, encryption has to be disabled. The RTSP stream is encrypted if that option is turned on. That's why to work with Alexa/Google Home, etc. you need to disable it.
You have several options: using SAGE zigbee sensor or firefly electronix doorbell sensor (wifi+MQTT). I have both. They work perfectly.
This is interesting, but I see no specific characteristic of the button press event. You should trace all common events (motion detection, etc.), capture...