I'm using the Refinitiv Eikon API (get_data) to input RICs and extract other identifying information, such as ISIN numbers. It seems at one point in time, you were able to use the Eikon API to call Worldscope Permanent IDs using the field source name "TR.WorldscopePermID". However, this is not returning any data. Is there another way to call the Worldscope Permanent ID through the Eikon API? Thanks.