...
First of all we have to make sure you set up everything correclty!
Double check that
Confluence is connected to Jira properly
Confluence is listed as linked in Administration/Applications/Application links
Confluence is authorized
You can easily check this:
Go to an issue, and choose Link option from More menu tab. Paste the URL of the linked Confluence page, try to link he issue. If linking is succesful, you are all set.
If the following warning message appears, click on authenticate and let yourself lead through the authorization steps.
There is no other page with the same name
...