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If you haven't installed alternative security software, you should temporarily turn off Windows Defender Security Center.
Third-party firewalls or antivirus software might prevent you from syncing your email and calendar events.
If your password is incorrect, you'll see a message asking you to update your password. Tip: If you want to change the password for your account with your email provider—for example, Gmail or i Cloud—you'll need to visit the website for your email provider.
See Change your password in Mail for Windows 10 for more information.
In the notification bar at the top of the app, select Fix account.Although we don't recommend permanently turning off security software, you can go to the software manufacturer's website to see if they have workaround steps, or you can temporarily turn off the software to see if that fixes the issue.If so, contact the manufacturer's technical support to find a way to access your email without disabling their software. If there's a feature you think is missing from the Mail and Calendar apps, or if a feature in isn't working properly, you can provide feedback directly to the Mail and Calendar team.Although we don't recommend permanently turning off security software, temporarily turning off the software will let you determine if it is preventing you from syncing your email or calendar events.Windows Defender Security Center is free security software that's included with Windows 10.