Note: I am using the latest version of Flutter's official google_sign_in plugin.

Hi @JacobWrenn
This platform is not meant for assistance on personal code. Please see https://flutter.dev/community for resources and asking questions like this,
you may also get some help if you post it on Stack Overflow.
Closing, as this isn't an issue with Flutter itself. If you disagree, please write in the comments and I will reopen it.
Thank you

Hi @iapicca yes, I agree. However Google's official google sign in plugin for Flutter says to leave feedback here. I think that this is a missing feature compared to the library on other platforms (unless I have just not found the right docs).

Hi @JacobWrenn
the goal of this github repository
is to improve flutter's framework and first party plugins
through bug reports and feature request;

at first sight your issue seems to be a request
for assistance on your implementation of google_sign_in.

If this is not the case please describe the issue with said plugin in details
Thank you

Ok @iapicca, I will rephrase as a feature request.

google_sign_in should have support for setting a serverClientID (used as the audience parameter in the OAuth login URL). This is a feature in other first-party google sign in libraries.

An example of how this could look alongside existing options would be:

final GoogleSignIn google = GoogleSignIn(scopes: ["email"], clientId: "abc123", serverClientId: "def456");
google.signIn();

The serverClientId parameter has been moved to the native configuration of the app (xml/plist) from the programmatic initialization.

See the updated example app here: flutter/plugins#2116.

Is the programmatic initialization still required?

Without additional information, we are unfortunately not sure how to resolve this issue.
We are therefore reluctantly going to close this bug for now.
Please don't hesitate to comment on the bug if you have any more information for us; we will reopen it right away!
Thanks for your contribution.

Could everyone who still has this problem please file a new issue with the exact description of what happens, logs, and the output of flutter doctor -v.
All system setups can be slightly different, so it's always better to open new issues and reference related issues.

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.

I think this is a valid proposal and we should implement this. @ditman @stuartmorgan

@cyanglaz is this because the serverClientId is a per-user value (like an ID Token) rather than a per-app config value?

This should have closed when flutter/plugins#5250 merged. Available in google_sign_in 5.4.0.