Two-Factor authentication may improve the overall security, but since you may need to create app-specific passwords, does not seem to improve security when compared to switching the setting to enable. The easiest option, without doubt, is to switch to enable on the security settings page. This allows them to connect to the account again.
Change the 'allow less secure apps' setting to enable.Read also: Use 2-Step Verification without mobile app. You may need to create an app specific password in the process for the app or service though. As mentioned earlier, accounts with it enabled are not affected by the change. Enable Two-Factor Authentication for the account.You have several options at your disposal to resolve the issue:
