To access Interactive Service Hub (ISH) for Dynamics 365, navigate to Settings and under Application, click on Interactive Service Hub:
If this is not in the sitemap, you can navigate directly to the Interactive Service Hub page by adding engagementhub.aspx to your Dynamics 365 URL, for example https://yourorg.crm.dynamics.com/engagementhub.aspx.
This will open a page that loads ISH:
You may see a message such as “Your browser’s effective resolution is lower than the recommended”:
Click OK. You will then see ISH loaded: