IM not able to create issue including epic link.? Can anyone please help me out?

[BHARGAV REDDI]

{

   "fields": {

      "project": {

         "key": "my project"

      },

      "summary": "Issue summary",

      "issuetype": {

         "name": "Test"

      },

      "assignee":{

          "name":"v_name"

      },

     "customfield_20207": "value"

   }

[Trudy P Claspill]

Hello @BHARGAV REDDI 

Welcome to the Atlassian community.

How are you using that JSON to create issues? Is it part of an API call? Is it part of an Automation rule?

Whatever it is part of, please provide the details of that context (code or rule), and tell us what messages are returned by the process. How do you know it is failing?