I wired the doorbell as per the instructions, and the existing chime did not work (although it worked fine with the original doorbell button prior). I tried a lot of things like a new chime, new transformer(s), etc. and nothing worked, although the Wyze door bell worked fine with the app. I finally discovered that the red wires were reversed at the chime. Apparently that doesn’t matter with the original button or getting power to the Wyze. This probably won’t help anyone else, but it worked for me.