• Go to Settings, then to Privacy, then to Email, Calendar, and People. After that, give applications access to your email and calendar.
• Restart your Mail app and attempt again to add the troublesome email account. Restart your computer and try again if the error persists.
• Search for the Mail & Calendar app in the Microsoft Store and click the Update option. Alternatively, select Downloads and updates from the More options menu. Many users reported that updating to the most recent app version fixed the issue.
• you should first set up the Calendar app before customising your email settings.
• Go to Manage accounts in the Calendar app, then click Settings.
• Select Add Account and follow the directions on the page.
• Check your email settings after your calendar data has synced.

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