This may be occurring due to one of the following:
1.You may be including “https://” in the server address field when setting up your account.
Add the email address without “https://”
2.Your time zone settings may be incorrect.
Check and correct your time zone settings if it is not properly set.
3.Your computer may not meet the Microsoft Exchange server’s security requirements. The most common reasons why your PC might not meet the Microsoft Exchange server’s security requirements for this account:
An administrator account on your PC doesn’t have a password. All administrator accounts must have a password.
To meet the security requirements, you can:
Set a password for all administrator accounts on your PC.
Remove administrator privileges for any administrator accounts on your PC that don’t have a password.
Remove any administrator accounts from your PC that don't have a password.
BitLocker couldn’t automatically be enabled on your PC. Enable it in Control Panel and then try connecting to your mail account again.
4.Your Microsoft Exchange server requires security policies that the Mail app can’t support.The Mail app supports the following Microsoft Exchange ActiveSync security policies:
Allow simple password
Minimum password length
Enforce password history
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