Hi @Abhishek Admin G
Thank you for posting your question on Microsoft Q&A.
Phone number acquisition and availability in Azure Communication Services depend on regional eligibility and subscription billing location. Even if your ACS resource is deployed in a supported region, phone number acquisition may not be available if your billing address or subscription country is not eligible.
You can refer to the official documentation for more details on regional and subscription eligibility here: Azure Communication Services - Number capability and availability
Hope this helps!