I'm trying to update the broker's name field that the lead is sent to.

when I'm creating the lead there is no broker so the field is exist but stays empty.

now when I'm trying to update him by update-record post request its stays empty! (when I try to update a field with content it updates him so I guess the problem is with empty fields).

also- how can I get the lead id? I'm trying with static id that I found and making tests on it.