Ring Video door bell Pro wont go into setup mode

I have purchased RIng Door bell Pro in Aug 2019 hoping to install it in my new house. I have purchased it from Amazon.com. I have finished building my house here in Australia & have installed the ring doorbell pro with 19v PSU. I can only see a dull white light and ring won't go into setup mode if I press & release the orange button on the right side. If I long-press the orange button then it restarts & goes back to the dull white light. I have changed the PSU to 24v with the same results.I have tried everything from removing the PSU & waiting for the battery to drain out and reconnecting it and after everything, the doorbell seems not to go into setup mode at allwhat do i do as i have 2 other ring light cameras which had no issues setting them up and those were purchased here in Australia