Whenever updating lead fields through the API, ensure that the correct schema name is passed, including the appropriate use of uppercase and lowercase letters, as the audit trail is case-sensitive. Even if the correct schema name is used but the letter case is incorrect, the field may update successfully on the Manage Leads page but will not be reflected in the audit trail.
Support ticket: #1612828
PFB for your reference.
Support ticket: #1612828
PFB for your reference.
