I'm sending a POST request to /rest/api/2/issue endpoint.
I can create an issue without the custom field just fine but when I add the custom field it complains:
"custom_field_name": "Field 'custom_field_name' cannot be set. It is not on the appropriate screen, or unknown."
I've added this field using GUI in project settings. Please let me know how can I "add it to the appropriate screen".
Best & Happy New Year!
EP