Did you install Duo Cam Doorbell using your home’s existing low-voltage AC wiring (like for a regular “dumb” wired doorbell)? I don’t have one of these new models, but based on the unboxing video and things I’ve read here, there’s maybe a step in the app’s setup process where you tell the app whether you’re doing a wired or battery-powered installation. Is it possible that you specified that you’re just using the battery, and maybe that’s why the app isn’t presenting you an option for the wired mechanical chime?
I don’t know if this is the case or not, but you didn’t state in any previous posts that you completed a wired installation, so I’m suggesting this might be a possibility.
Welcome to the Forum, @Renegade_R! 