Exchange 2013 OWA user must change password at next logon not working

Hi,

I have installed Exchange 2013 on Windows 2012 Server. I create users in ECP and select "user must change password at next logon" option. When newly created user logs in, the OWA page doesn't prompt for password change and just throws error "The user name or password you entered isn't correct. Try entering it again"

I have enabled Change Password feature in CAS server, but still not working.

Any answers, suggestions would be great help

Regards

Sunil