@AndreaCiciliano-9448 Thanks for asking question!
Please double check on Prerequisites for enabling alphanumeric sender ID
- An Azure account with an active subscription. Create an account for free.
- An active Communication Services resource.
- An eligible subscription address.
Also, Refer to SMS overview page for list of countries that are supported.
To enable preregistered alphanumeric sender ID, go to your Communication Services resource on the Azure portal.
Navigate to the Alphanumeric Sender ID blade in the resource menu, select preregistered tab and click on "Submit an application" button to submit the registration form. Once the application is submitted, the provisioning typically takes 4-5 weeks before it is available to use.
Please let us know if still facing issue happy to assist