Is there any way to get a promotion code for the Digital Sales Next Gen UI feature

Summary:

I am the gate keeper of Sales Cloud GC3 environment, For internal project, I need to access the Digital Sales Next Gen UI feature.

But it seems I need to a promotion code for it. Please let me know how to get a promotion code to access the Digital Sales Next Gen UI feature.

Content (required):

I want a promotion code to access the Digital Sales Next Gen UI feature on my GC3 environment.

Click Navigator > My Enterprise > Enterprise work area.

On the Enterprise Information page, click the Manage Promotion Codes link.

On the Manage Promotion Codes page, click