So finally managed to take a look again.You should have received a notification on HA which once opened, would be a captcha puzzle for you to enter to complete the verification.
Maybe post your log here.
Got the captcha puzzle, authenticated and now i have the echo dot media player entities.
When i ask Alexa to switch anything on, it just says it cannot find that device
So right now i can control Alexa using HA, but can't control HA using Alexa