So I have been using my LaView One Halo for almost 3 years now, still running LaView's firmware 190716 and have been using the EZVIZ App for a few years now, never had a Chime issue. I am running the latest version of their App. I did try other F/W's way back but never tried the Hik firmware other's here use.For anyone with the LaView One Halo version of this cam having issues making the a doorbell chime work make sure you are using firmware from LaView and initialize the camera using LaView's App.
My mechanical doorbell chime would not work using other firmware, regardless of the app or if set up using a manual connection.
I was trying to avoid any cloud based apps by manually connecting my camera using the Nelly's "Windows LAN" instructions but the mechanical chime would not work, even if I connected the camera to the LaView app (hit or miss with different firmwares).