Pre-emptive authentification

Hi,

I’m having trouble connecting / sending API messages using SOAP.
Server is excepting Pre-emptive authentification, and I cannot seem to find it anywhere on the tool to configure or in headers.

This is the issue, because using another tool (SOAP UI) this is the only difference in config and also in (SOAP UI) if I don’t use preemptive authentification, connection is not established.

Thanks

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