If you are using Gmail, you may need to change a security setting to allow “less secure” apps access to your account depending upon the email client you are using. To change this setting, go to you Google account page, select Security and the scroll down to the Less Secure App Access setting and turn this on. If it is your email client that is causing the issue, this will get you up and running. I advise looking into a different client or updating the one you have if an update is available.
I just had this same issue on my laptop when trying to use an older version of Outlook to access my email. Changing the above setting resolved the login issue.