Channeltivity's integration with Microsoft Dynamics 365 CRM requires a Dynamics Admin to authorize Channeltivity access to Dynamics by navigating to Settings (in Channeltivity) > Dynamics 365 Integration > Overview & Authorization > Authorize. 
Enter the unique subdomain of your Dynamics environment. This is the part of your environment URL that comes before .crm.dynamics.com. For example, if your URL is https://acme.crm.dynamics.com, your subdomain is acme."
Select the Dynamics 365 app you'd like to link with Channeltivity. This app determines where Channeltivity will access your Accounts and Contacts data.
Once the systems are connected, you can begin configuring the Dynamics 365 Organization Sync .