Issue Summary

1. When adding Jira dashboard links into pages in Confluence, they're displayed as Smart links, which loads the content from Jira in Confluence page directly;
   • https://support.atlassian.com/jira-software-cloud/docs/share-jira-dashboards-in-confluence/
2. Once custom domains is enabled, these previews break.
   • And new smart links don't work as well.

Steps to Reproduce

1. Copy the URL of a dashboard from Jira Cloud

   • https://site-name.atlassian.net/jira/software/c/projects/Project_KEY/boards/1

2. In the same site with Confluence, pages the URL into a page.
   • It should by default load the link in the "Embed" view, and displaying the Jira board in Confluence.
     • 
3. Enable custom domain for Confluence.
4. Visit the same page from before, and the smart link will no longer load.
   • 

   • sitename.atlassian.net refused to connect.

5. The same issue is seen if we enable custom domains for Jira only, or both Confluence and Jira.

Expected Results

• Enabling custom domains should not prevent Smart links from loading content from Jira.

Actual Results

• Enabling customer domains blocks the connection request to load Jira smart links.
  • Request:

    https://sitename.atlassian.net/jira/software/c/projects/Project_KEY/boards/1/embed?quickFilter=1&themeState=dark%3Adark+light%3Alight+spacing%3Aspacing+typography%3Atypography-modernized+colorMode%3Alight
    

  • Status:

    (blocked:other)

Workaround

• Currently there is no known workaround for this behavior. A workaround will be added here when available