Update concepts.md

Author: krkutser

articles/communication-services/concepts/sms/concepts.md

@@ -51,7 +51,7 @@ Sending SMS to any recipient requires getting a phone number. Choosing the right
 
 \* See [Alphanumeric sender ID FAQ](./sms-faq.md#alphanumeric-sender-id) for detailed formatting requirements.
 > [!IMPORTANT]
-> Effective **April 19, 2024**, All UK alpha sender IDs now require a [registration application](https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/sms/enable-alphanumeric-sender-id#enable-preregistered-alphanumeric-sender-id) approval.
+> Effective **April 19, 2024**, All UK alpha sender IDs now require a [registration application](https://learn.microsoft.com/azure/communication-services/quickstarts/sms/enable-alphanumeric-sender-id#enable-preregistered-alphanumeric-sender-id) approval.
 
 ## Next steps