Ask about custom alexa smarthome skill by TomerFi

Hi, i’m a newbie,

Im following this guide to create a custom alexa skill to control AC via climate (https://github.com/TomerFi/home_assistant_custom_ac_alexa_smarthome_skill), but im stuck at step Configuring the skill interface: Part 2, i did all the thing, but when i enable my skill on alexa app, i got this error:

We were unable to link Ngoi Nha Thong Minh at this time.
The authorization server returned with an error parameter. Please refer to https://tools.ietf.org/html/rfc6749#section-4.1.2.1 for more details.

my config at this step is:

I thing since the interface for developer has changed so the tut is not true anymore, i do some search but dont know how to link account with amazon.

Pls hepl.
Thanks

Anyone can help? Thanks a lot

You can pm Mr.TomerFi and ask him.

Sent already, but got no response.