Outlook prompts for credentials when creating new profile

Hello,

I've installed Exchange 2013 environment with 2 servers:

1 CAS server, 1 mailbox server.

I have an issue with creating 1st time outlook profile.

when I'm creating for 1st time my outlook profile, I have prompt for credentials at the end of the configuration.

Is that normal with Exchange 2013? if not, what should I configure to make SSO as in previous exchange versions.

Thanks ahead