We do not offer phone support but we would be more than happy to assist you right here on the Community website.
When we resolve issues on Community, it ensures that our entire team has access to the discussion and can weigh in as needed. This means that not only can our support team contribute, but so can our QA team, developers, and senior staff.
As for this issue itself, can you please confirm what exactly you are seeing in Roon Settings -> Extensions? If you can provide a screenshot by using these instructions it will help me better assist you. This is an example of what is should look like once paired:
I would confirm that you have authorized and paired the Crestron extension first, and make sure that you have set each of your zones appropriately via a Roon Remote via the following menu:
Can you share a few screenshots of how these two menus look like on your end? Also, can you please specify the model of the Crestron processor are you using?