The new accounts are created for users because the IDP plugin is not able to map user coming in from IDP to the user already registered in Atlassian.
You will need to map the IDP’s attribute which has the email address to Email field given in User Profile tab.
Here are the steps to map the email attribute and make sure the user’s email address is matched:
- Click on Test Configuration button in Configure IDP tab to see the attributes coming in from IDP
- Copy the Attribute Name against which you see email address and paste it into Email textbox in User Profile tab
- For the option Login/Create Jira user account by, choose email
- Save Settings
