Customers have the choice to utilize a specific Microsoft Endpoint that they want to hit for this integration, it can be a specific Azure Endpoint from a specific country from which they want the service to be served or a Microsoft On-Prem End Point which also supports On-Prem Co-Authoring.
If customers want to configure a customized Microsoft EndPoint for this integration the current process is to send an email to firstname.lastname@example.org with your domain name (e.g. acme.egnyte.com), your custom URL, and a contact point to reach you at.
We will review the requests on a case-by-case basis.
Once you've enabled and configured the integration, this article can walk you through creating and editing a file in Office Online.