Issue Summary

When trying to connect a Confluence space with a Jira project, in different instances through an application link, Confluence throws an HTTP 500 error.

Steps to Reproduce

1. Create an application link between Confluence Cloud and Jira Cloud in different instances;
2. Go to the Confluence space's settings;
3. Click on Application Links under Integrations;
4. Click on the Add Link button and select the Application link from step 1;
   • You might need to authorize Confluence to connect to Jira through OAuth for the first time
5. Paste the project name or project key and click on it;
6. Select Yes, create a link from...
7. Click on the Create button;

Expected Results

The Confluence space is successfully connected to the Jira project.

Actual Results

Confluence throws the following error message:

Failed to create a reciprocal link in the remote application: com.atlassian.sal.api.net.ResponseException: Received 400 - Bad Request

You can also confirm this behavior by looking at the Network tab(Browser Devtools) and searching for the ConfluenceSpaceEntityType request.

It should display the following HTTP 500 error in the Response:

{
    "message": "Failed to create a reciprocal link in the remote application: com.atlassian.sal.api.net.ResponseException: Received 400 - Bad Request",
    "status-code": 500
}

Workaround

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