Issue Summary

When fixing Confluence links in Jira, the app is showing:

An application link is missing in the product you're trying to update. Go to your product's settings and create an application link to the destination product in Cloud. 

This only happens when System Confluence is using custom domain

Steps to Reproduce

1. Update Confluence Cloud URL with custom domain
2. Migrate Jira and Confluence data from DC to Cloud, to the same site
3. Attempt to fix Confluence links in Jira

Expected Results

Confluence links are updated

Actual Results

Confluence links failed to update, with error:

An application link is missing in the product you're trying to update. Go to your product's settings and create an application link to the destination product in Cloud.

Additional notes

Fixing Jira links with custom URL is working as expected in Confluence.

Workaround

Revert back Confluence Cloud to the original URL then trigger the link fix again