Connecting Alexa to HA - Invalid Authentication

Hi folks. Newbie here to all things HA. I was super excited to configure my Raspberry Pi5 and install Home Assistant on it and have a bit of a play. One of the challenages that I am facing now is why I’m unable to add my Alexa device to HA. I’ve followed the steps a zillion times and tried the suggestions offered on Google Search and Copilot without any success. No matter what I do, I cannot get passed this authentifcaiton issue. I’m able to log into my Amazon account using the OTP from the Authentication app so I don’t believe there’s anything wrong with my account as such. I’m based in Melbourne (AUS) and from what I can tell, my regional settings are all correct. I log in via the .com.au domain. Would love to hear from other who have had similar issues and what tips/tricks there are to getting past this issue. Thanks all :slight_smile: