User authorization failed with the Middleware system

What causes this issue?

Client Error:- Authorization error while communicating with the HCI
Service.
SOAP Fault: Unauthorized

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Incase HCI Service expects a client certificate, make sure the client
certificate provided in <DS:TRAN.SOAMANAGER>SOAMANAGER</> for the
Consumer Proxy <ZH>CO_CODERINT_CONNECTIVITY_CHECK </>is added to the
corresponding HCI iFlow sender system.
Incase HCI Service expects basic authentication make sure under
authentication settings in SOAMANAGER for the Consumer Proxy <ZH>C
O_CODERINT_CONNECTIVITY_CHECK</>, a valid SCN user authentication
information is provided.
@0S@
Check <DS:TRAN.SRTUTIL>SRT_UTIL</> -> ERROR LOG for the Short Text.
If the text is HTTP Code: 403 ( Forbidden ) then following are the
possible solutions:
Incase of cerificate based authentication - The client certificate is
bound to the HCI sender system in the iFlow
Incase of basic authentication - The user privided in SOAMANAGER has
the role ESBMessaging.send assigned to it for the given HCI tenant.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.