Need help about a Google Nest integration issue

Configuration
1

I am new to Home Assistant. I used to use Nest integration before, and HA was running completely locally during that period.
Since I moved my house and network, Nest integration stopped working even when I did reconfiguration.
So I decided to redo everything, create a new cloud council project, etc. This time, I am running HA with the DuckDNS and SSL setup. Somehow, it just doesn’t work. Does DuckDNS setup impact the integration?

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Update:
It now opens the link but fails link Nest: (homeAssistantDuck is the Google Cloud Project Name)

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2

How were you authenticating to Nest. Were you using a Works With Nest authentication perhaps?

From Google Nest - Home Assistant

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3

I don’t think so. I am using that big blue button. image
And there’s no log information at all.