If you have a Jira Useraccount, please use your Jira Username and the same password like in Jira for the login.
If you use the email address of your Jira account you will pass the login.
But you will NOT be able to see any jobs and you will break your working Jira Account in JConnect!
Jira Username and JConnect Email are different credentials! Please don't start to mix them up.
This issue can only be solved by an administrator.
A long term fix is in development.