Confiforms IFTT Integration with JIRA - User "field cannot be set" error although field populated

[jokolbe]

I have a reporter field in ConfiForms set to User field type as follows:

For SOME users (working for me when I try to submit the form) the following error occurs indicating that the reporter field cannot be set

IFTTT Rule

#set($typeid = "[entry.type.id]")

{
  "fields": {
   "project": { "key": "XX" },
   "issuetype": { "name": "Story" },
   "priority": { "name": "[entry.priority.label]" },
   "reporter": { "name": "[entry.reporter.username]" },
   ...
  }
}

[Alex Medved _ConfiForms_]

If this happens for some users then it means it is a permissions issue.

The field must be on a create screen and your users should have permissions to set it. Most probably your users that receive an error from Jira have no permissions to set this field.

[Matt Doar]

Looks like the Reporter field needs to be added to Create or Edit screens in some Jira projects

[jokolbe]

The JIRA project already has a reporter field 

This issue also only happens for some user. When I submit myself, everything works as expected and no error is present.