New Orbi RBR50/RBS50 Firmware Version 2.3.1.48

So this was all going well then I decided to try this bridge mode thing... (there goes 2hrs of my life).

I researched a few articles and watched a video to prepare for this change.

Put the Telstra TG799vac into bridge mode per the GUI.

Put the Orbi back into Router mode from AP mode (found out that when in AP mode you loose Cricle and Armour etc.).

The TG799 appeared to line sync with my ISP (Aussie Broadband) OK according to the lights on the box itself.

I could get to the Orbi GUI OK but it just kept saying no internet connection.  When I would troubleshoot it, it would ask for PPPoE user and password despite me selecting in the Orbi settings that this was not required.

I could not get back to the TG799 as it was now off the grid in bridge mode even when I turned the WiFi back on.  Did a few restarts, called ABB and they could not help so stuck the pin in the back and reset it.  

I am now back to the TG799 in default mode which I presume is a router/modem mode (turned off the WiFi) and Orbi in Router mode.  What is the downside of doing it this way (both in Router mode) vs bridge mode which did not work out for me?  Is there a downside?

Should I have changed the hardware setup at all?  I have a network cord running from the TG799 LAN port to the Orbi Internet Port (Yellow).  I also tried from the WAN port (Red) on the TG799 but that did not seem to change anything. 

Should I have changed other settings on the TG799 other than just slecting bridge mode.

Thanks