Not able to connect CRM instance with Social Engagement Pro.

HI All,

 I am new to Dynamics CRM World. We have license of CRM Enterprise and we are trying to connect Social Engagement Enterprise with CRM Instance. We have tried almost all steps mentioned on help docs of CRM.

When we try to connect it gets connected successfully but when i try to set CRM instance as default Instance then it is giving error message "That didn't work.Please check your credentials and try again"

Any Help would be much appreciated.