If an app doesn’t meet our security standards, Google might block anyone who’s trying to sign in to your account from it. Try updating the app or your device's operating system. If the app or the operating system on your device is out-of-date, you might not be able to connect it to your Google Account. If you’ve entered your password correctly but you’re still getting the error, you might need to update the app or use a more secure app.
Sometimes you’ll see a 'Password incorrect' error when you sign in to Google with a third-party app, like Apple’s Mail app, Mozilla Thunderbird, or Microsoft Outlook.
