# 21711: Sender is not associated with the specified Messaging Service

Log Type: APPLICATION

Log Level: WARNING

## Description

You tried to use a phone number, short code, or Alphanumeric Sender ID with a `MessagingServiceSid`, but that sender is not associated with the Messaging Service you provided. When you send with both `MessagingServiceSid` and `From`, the `From` value must come from that service's Sender Pool. If you omit `From`, Twilio selects an eligible sender from the Sender Pool for you.

### Possible causes

* You included both `MessagingServiceSid` and `From`, but the `From` value is not in that Messaging Service's Sender Pool.
* The sender was never added to the Messaging Service.
* You are trying to send with a sender type that must first be associated with the Messaging Service, such as a phone number, short code, or Alphanumeric Sender ID.

### Possible solutions

* Add the sender you want to use to the Messaging Service Sender Pool. You can add phone numbers, short codes, and Alphanumeric Sender IDs to a Messaging Service by associating those resources with the service.
* If you send with both `MessagingServiceSid` and `From`, update `From` so it matches a sender that is already associated with that Messaging Service.
* If you do not need to force a specific sender, remove the `From` parameter and let Twilio choose an eligible sender from the Messaging Service's Sender Pool.
* If the Messaging Service does not have a sender configured yet, add at least one sender before retrying the request.

#### Additional resources

* [Get started with Messaging Services](/docs/messaging/tutorials/send-messages-with-messaging-services)
* [Messages resource](/docs/messaging/api/message-resource)
* [Services PhoneNumbers subresource](/docs/messaging/api/phonenumber-resource)