[FR] Provide more details for SENDER_ID_MISMATCH if I have permission to see across projects

リポジトリのファイルやテストは指定されていません。まず、このリクエストが firebase-admin-node と Firebase ポータルのどちらに該当するかを判断し、次に既存の verify-ID-token API とリンク先の Android SDK issue を確認してください。ユーザーがアクセス権を持っている場合に限り、トークンに登録されたプロジェクトを特定できる実装範囲について合意できれば完了です。

Is your feature request related to a problem? Please describe.

As a developer, I'd like to be able to verify an ID token across all projects that I have access to in Firebase. There is an existing API to do so today but requires specifying a project ID and providing the correct credentials for each project.

https://firebase.google.com/docs/auth/admin/verify-id-tokens#verify_id_tokens_using_the_firebase_admin_sdk

Describe the solution you'd like

During debugging, the SENDER_ID_MISMATCH response tells you that a token is registered against a different project than it's being used for, but does not tell you what project it is. Since the Firebase portal knows which projects I already have access to, it would be helpful to have this built into the Firebase portal where, if I have access to the project, it can tell me the project it is registered to. Often, we will have dev/prod Firebase projects and provide the config during build time; this would help us debug the issue if they got mixed up.

Describe alternatives you've considered

It's possible to write a version of this on our own using a script that loads credentials and tests tokens against each project I have access to, but is not very friendly to get the necessary credential files for the script.

Additional context
I was forwarded here from the android SDK repo https://github.com/firebase/firebase-android-sdk/issues/5545