What urls are you feeding into the systems? The unique IDs the systems use should be totally different, the only way I can think of getting the same one is to clone a service from one place to another, but you'd have to be trying to link JIRA to a clone of itself, not a Confluence.
I'm posting because I did not see anyone post the solution anywhere.
I suspect this issue occurs when you have Confluence and JIRA hosted on the same server but have configured them with two different FQDNs.
The fix is to configure the link while logged in Locally to the server.
I had to use the FQDN for friendly URL and the localhost:8090 for applicaiton URL then it connected without issues.
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