Did all that.
Removed the chime from the app, closed the app. Reset the chime with the button on the side. Reopened the app and added the chime. No difference.
I can set the volume and ringtone for the chime in the app, test it, it reacts fast, also when pressing the ring doorbell.
Default ringtone (cuts the most) at max volume and all I get is 62dB at 1m. using the dB meter app on my iphone. It’s below conversation level. Won’t do.