If the goal is to invite a JIRA user into your Confluence environment, you can invite the user from here: https://yourconfluenceURL/admin/users/inviteuser.action.
Note: This will consume a Confluence license.
The title of the question is sounding like you need a service account listed in your global permissions to pass the health check. A Confluence service account should be made in case your SSO goes down - you then have the ability to log in.
Please verify you have an admin account listed in the individual users section: https://yourConfluenceURL/admin/permissions/globalpermissions.action
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.