SOAP service error, urgent!

Dear Sir/Madam,

We are developing a process for a client which involves a SOAP request. When we enter the connection link and login/password (Simple authentication), we get error 401.5. However, the client is telling us that access is set up correctly. Any thoughts on how to resolve this issue? This is somewhat urgent, thank you in advance for your help!

This apparently is caused by UIPath activity not transmitting a header "Authentication Basic: " prior to login/password, anybody knows how to fix that?

Simple Authentication should add the header - can you use Postman to simulate outside of UiPath and make sure you’re calling it correctly and permissions are set?