Doorbell installation issues

Got a new Telus Doorbell Camera.  Cannot get past step "12C - Ring the doorbell" where the "ring" is supposed to be heard at both the doorbell and the main chime.   The doorbell sometimes rings when pushed after breaker reset, sometime not.  The main chime never rings when it should.

Things to note - the light on the doorbell is green, chime is buzzing even after chime adapter has been installed, voltage at the transformer is 18.4 and 18.3 at the doorbell (with new transformer).   Not able to establish bluetooth connectivity.  Wifi speedtest at the doorbell is 138.3 down and 38.3 up.

We've replaced both the transformer and the mechanical door chime and get the exact same behaviour with both the old and new.

Did we get a lemon?   Not looking forward to spending another half day on the phone with support.  Or another half day running around getting new parts and swapping things in and out.