You may know that Issue Forms for Confluence does not support the customer portal configuration of the project type Service Desk.
You can use the Issue Form - create form, if you follow the Step-by-step guide.

Step-by-step guide

1. Change the Permission Scheme (must be done by a Jira Administrator).
   
   

   1. Grant the permission Create Issue to Application role - Any logged in User.
      
      

   2. Grant the permission Browse Projects to Reporter.

   
   
   

2. Change the Screens (only required for version < 2.1.0 and must be done by a Jira Administrator).
   
   

   1. Remove the Field Request participants from the issue create screens of the project.
      
      
      

3. Now you can use the Issue Forms - create form. The form will be shown to all users who have the permission to login to Jira. 
    

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