Hello SAP experts.
I'm trying to avoid the user request when calling a specific ICF service from my S4HANA 1809 system, I've configured a default user in "logon data" section of mi ICF service as you can see in image below:

However, when I call the service in the browser it request me user and password again:

I've tried the same approach in different systems (S4HANA and ECC 6.0) and worked fine, meaning that any user was requested in those systems.
I have compared the ICF service parameters and configurations with the other systems I mentioned that works fine, but nothing helped.
I performed ICM traces and ran SEC_TRACE_ANALYZER report to check out the service behaviour, but I haven't detected anything wrong so far.
Do you have an idea of what could be wrong with it? Why is always calling the authentication?
PD: the service refers to a Web Dynpro ABAP application.
Thanks in advanced.
Best regards.