Application with id 'null' not found
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Summary
Problem
The following appears in the Application link page:

Diagnosis
Confluence and JIRA are in the same server.
Cause
The application links are not correctly created.
Solution
Resolution
This issue can be solved by adding a context path to Confluence and JIRA URL with the following steps:
Remove the application link you created before
Stop Confluence and JIRA
Create Application link using the new URL
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