Switching accounts results in a 403: Delegation denied error

アカウント切り替えフローと GIDSignIn.sharedInstance.restorePreviousSignIn から始め、ログアウトとログインの前後でトークンとセッションの状態を比較します。iOS 16.2 で Gmail のリクエストシーケンスを再現します。アカウント 1 からアカウント 2 に切り替えると、その後の Google API 呼び出しでアカウント 2 が使用され、アプリの再起動が不要になれば完了です。

Describe the bug
I'm running into an odd bug where I can can successfully switch between multiple Google accounts (say from account 1 to account 2), but Gmail (or any other Google service) believes I'm still logged in account 1.

To Reproduce
Steps to reproduce the behavior:

1. Login with Google account 1

2. Observe that the API calls to Gmail are successful

3. Logout and login with Google account 2

4. Observe that the app received a new auth token and account 2's email address

5. Any call to Gmail will now result in a "403: Delegation denied error for <Account 1>"

6. Kill and restart the app

7. The app will restore the previous session without user interaction using GIDSignIn.sharedInstance.restorePreviousSignIn

8. Observe Google account 2's session was restored and now all calls to Gmail are successful

9. Login with Google account 1

10. Observe that the API calls to Gmail are successful

11. Logout and login with Google account 2

12. Observe that the app received a new auth token and account 2's email address

13. Any call to Gmail will now result in a "403: Delegation denied error for <Account 1>"

14. Logout and login with Google account 1

15. Observe that the app received a new auth token and account 1's email address

16. Calls to Gmail for account 1 are successful

Expected behavior
I expect to be able to log out and log in with a different account successfully

Screenshots
None.

Environment

• Device: Simulator and iPhone 12
• OS: iOS 16.2
• Browser: Swift app

Additional context
Add any other context about the problem here.