What's wrong with this API to create External Identifier?

Summary:

Error 400: Bad Request

Content (please ensure you mask any confidential information):

url:

https://xxxxxx.fa.ocs.oraclecloud.com/hcmRestApi/resources/11.13.18.05/workers/00020000000EACED00057708000110D932621A7A0000004AACED00057372000D6A6176612E73716C2E4461746514FA46683F3566970200007872000E6A6176612E7574696C2E44617465686A81014B59741903000078707708000001A113A8EC0078/child/externalIdentifiers

body:

{    "ExternalIdentifierNumber": "C33465W",    "ExternalIdentifierType": "CAAB_SAM",    "FromDate":"2026-10-07"}

header:

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):