Elements Vulnerability Management API call to enable vulnerability agent scanning fails with error "Request header field X-Forwarded-For is not allowed."

Issue:

Using the following API endpoints to enable or disable vulnerability agent scanning:
"https://portal.radar.elements.withsecure.com/api/latest/things/enable"
"https://portal.radar.elements.withsecure.com/api/latest/things/disable".

Getting the error when trying to enable scanning.
Error: Request header field X-Forwarded-For is not allowed.

Resolution:

Make sure that you have switched to the new API endpoint https://api.radar-prd.fsapi.com/

Example (use POST method):
curl 'https://api.radar-prd.fsapi.com/api/latest/things/enable ' \
-X POST
--data-raw '{"CcrIds":["x