Dynamics Nav 365 integration with Dynamics 365 Sales


I’m working on an integration between Dynamics NAV 365 and Dynamics 365 for sales, I’m trying to connect using Microsoft given link (“https://*.crm4.dynamics.com”) and whenever I test the connection or enable the connection I get the following error ( Microsoft Dynamics 365 Business Central The connection setup cannot be validated. Verify the settings and try again. Detailed error description: The system is unable to connect to Microsoft Dynamics CRM. Detailed description: Unable to Login to Dynamics CRM. )

Any help would be appretiated!

Thanks in advance.