Fields of the workitem to collect (comma-separated)

[estela2902]

I'm using the RESTRequestButton

I'm putting in the field 'Fields of the work item you want to collect (comma separated)' the values:

System.Id, Custom.5756ed1d-2b15-4b2c-9d20-f911f2a22ae8

where the second one is a custom control (a picklist)

In the payload received in my API I'm not seeing this custom field. I see:

{"System.Id":44725,"Sender":"WorkItemRESTRequestButton","User.Id":"b735a8d4-2336-64d3-8c7f-054c248c2347",.....

How can I solve this error?