How to set the URL while doing the subcription process when accpeting a private offer in Azure marketplace. The subscriptuon process directing to wrong URL

Question

How to set the URL while doing the subcription process when accpeting a private offer in Azure marketplace. The subscriptuon process directing to wrong URL
The issue that I am having is our customer has subscribed to a private offer (that is good).

But, when they try to "configure their account" (as the last step of the subscription process), they are being taken to a URL at abc-ms.com, rather than abc.com. I am trying to see what options we have to fix that issue so that the customer can finalize their subscription.