JIRA throwing error when uploading junitxray report

I have generated a junitxray report using newman as a library & have submitted the reports to JIRA using endpoint: https://jira.{{domain}}.com/rest/raven/1.0/import/execution/junit?projectKey={{projectid}}.

However, the API is returning the following error:
“error”: “Error assembling issue data: Field ‘customfield_11615’ cannot be set. It is not on the appropriate screen, or unknown.”

Can you please advise on a where I need to look to resolve this? I have been able to upload junitxray reports successfully previously to the same project. Could this be related to JIRA config changes?

I have tried to re-install newman-reporter-junitxray and re-generate the reports but the API is returning the same error. A step in the right direction to resolve this would be great.