I tried everything short of swapping the transformer as I have NO idea where it is. Tried every possible wiring combination with and without the controller. Tried the different chime settings. Finally gave up and bypassed the mechanical chime and setup my two inside cameras to work as bells. I live out in the sticks and it’s very rare to get any doorbell action. It’s more of a camera than a doorbell. Love the local storage option.
I noticed that you posted this elsewhere, so I left a more detailed response over there. 
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I found it! On settings go to chime and select mechanical. That’s it! Took me hours!
I wired to Trans and Front directly. Chime on mechanical and it worked. No chime controller.
Welcome to the Forum, @thegeckster! 
For what it’s worth, when I operated my Video Doorbell v2 without the standard Chime Controller installation, my home’s built-in mechanical chime worked but also made extra unpleasant rattling/humming sounds, and Support told me this is “normal”. (I didn’t like that answer, so I found my own solution, which I’ve documented elsewhere.) Reportedly Duo Cam Doorbell suffers a similar problem when wired without Chime Controller. Other Forum users have also reported success without the Chime Controller, though, so good luck!
Let us know if you have other questions or need help finding anything else in the app.