Communication Services: Unable to Acquire Phone Number — Tenant Eligibility or Configuration Issue

Problem description

I am trying to acquire a phone number for my Azure Communication Services (ACS) resource, but the Azure portal shows the message: "Phone Numbers are not available to your Azure tenant." I want to understand why this restriction exists and what I need to do to enable number acquisition.

Environment

An Azure Communication Services resource used for telephony/phone number acquisition in the United States region.

What I've already tried

I have verified that my account has the necessary Owner role at the subscription level and the Communication Service Owner role on the ACS resource. I have confirmed that no Azure Policy restrictions or billing restrictions are in place affecting the purchase. I also attempted to check for available phone numbers in the portal, but the message persists.

Current status

I am seeking clarification on whether the issue is due to tenant or subscription eligibility restrictions, or if additional configuration or permissions are required to enable phone number acquisition for my ACS resource.