Occasionally, when utilizing a third-party program to log into Google, like Microsoft Outlook, Mozilla Thunderbird, or Apple Mail, you may encounter a "Incorrect Password" error. You might need to upgrade the app or switch to a more secure one if you entered your password correctly but are still receiving errors.
Update your operating system or app.
Connecting your device to your Google account might not work if the operating system or software on it is outdated. Consider updating your device's operating system or application.