# Custom domains #### Even if a Jira organization has its own domain configured, proper protection requires adding the instance using the original Atlassian URL. *** ## General information You can add your **Jira** organization that uses a custom domain to **Xopero ONE**, but you must use **its original address instead of the custom one**. This limitation results from how **Atlassian** identifies and authorizes organizations. **Atlassian** security and administration APIs are bound to the organization’s original **Atlassian**-managed URL (for example, yourcompany.atlassian.net), **not to the custom domain**. The custom domain is mainly a user-facing alias for access and branding. Internally, **Atlassian** continues to recognize, authenticate, and grant permissions to the organization only through the original URL registered in **Atlassian Administration** ([https://admin.atlassian.com](https://admin.atlassian.com/)). As a result, **Xopero ONE** must use the original **Atlassian** URL to correctly: 1. Identify the organization and its applications. 2. Authenticate API requests. 3. Apply security and access controls properly. Using the custom domain would prevent proper authorization and could lead to failed connections or incomplete protection, which is why the original **Atlassian** URL is required even when a custom domain is in place. *** ## Finding the original domain URL You can find your custom domain's original URL in > **App URLs** > **Custom domains** > **Actions** > **Show details**.

The original URL of your custom domain will be listed under **Details** section as **default URL (fallback)**.