You’re not alone:
In the meantime you have options of using the “Cameras as Chime” feature with certain Wyze camera models (if you’re currently using any of those) and/or using your home’s built-in mechanical chime (if you’re using the doorbell in a wired configuration and actually have a chime installed), though some users have been reporting in the Forum that the latter isn’t showing up as an option in Duo Cam Doorbell’s settings in the Android app, so that still seems like a work in progress.