I finished the OAuth Account Linking. I can log in successfully before.
But now, It did not (for both Google Console Test and Google Assistant used by Gmail Account), it always informs me that "Sorry, something went wrong, so I couldn't sign you in. But you can try again later."
Steps :
I make sure :
the OAuth server worked, since it worked for Amazon Alex application,
OAuth server does not change anything, ex. : clientId, clientSecret, ...
Webhook server (nodejs code) did not change codes related to google actions sdk, or Sign In codes line.
People who knows,
Please give me more ideas about this issue,
Thank you very much,
I got mistake, the secret key was changed,
I must typed correct secret key at Google Console => Develop
DONE.