AuthSession: Google x Firebase, Authorization Error

I am trying to implement Google sign in with AuthSession so that I can make my application both for iOS/Android and for web.
(expo-google-app-auth works in my application, but I want to support web platform)

I implemented the basically same code as Google x Firebase example, but gets the error of the above screenshot.

I see the google oauth2 document and it supports S256 challenge method.

Can someone suggest the reason for this error?

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I have the same problem. Stumped by this.