You can try the following methods if you receive a "2FA Code Error" message when you enter your Google 2FA code.
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- Synchronize the time on your device: (For iOS, set the time zone under Settings - General - Time and Date. For Android, go to the Main Menu of the Google Authenticator app, then go to Settings - Time correction for codes - Sync now).
- Login using another browser or using Incognito Mode on Google Chrome.
- Clear your browser cache.
- Try to log in again using the app.