CREATE businessProcessApprovalDelegationRules Rest API with error

Summary:

The Client need to use the REST API businessProcessApprovalDelegationRules to create Delegation Rules

But when we try to use we receive an error:

"title": "Bad Request",
"status": "400",

We need to know if this Rest API is working fine and we can use it or if Rest endpoints should not be used externally

Content (please ensure you mask any confidential information):

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

25b

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