# 30100: Domain SID is invalid

Log Type: APPLICATION

Log Level: ERROR

## Description

This error means the Domain SID in your request does not identify a valid domain in your Twilio Organization. When you configure Link Shortening, get the Domain SID from Twilio Admin > Domains and use that value when you associate the domain with a Messaging Service.

### Possible causes

* The Domain SID belongs to a different Twilio Organization.
* You copied the wrong value into the request. For example, you used your branded URL or company domain name instead of the Domain SID.
* The Messaging Service you are configuring does not belong to an account in the same Twilio Organization as the Link Shortening domain.

### Possible solutions

* In Twilio Admin, open **Domains**, select the domain you want to use, and copy the Domain SID from the domain details page. Then use that SID in your request.
* If you use the API, place the correct Domain SID and Messaging Service SID in the Link Shortening domain's Messaging Services subresource request.
* Confirm that the domain and the Messaging Service both belong to the same Twilio Organization before you save the configuration or send the request.
* If your company uses more than one Twilio Organization, verify that you are working in the correct Organization for that domain. Twilio can also support multi-verified domains for eligible Organization setups.

#### Additional resources

* [Link Shortening](/docs/messaging/features/link-shortening)
* [Link Shortening Onboarding Guide](/docs/messaging/features/link-shortening/onboarding-guide)
* [Domains](/docs/iam/organizations/domains)