I would like to access SharePoint 2013 on-prem OR SharePoint Online REST or SOAP API's and test them using SOAPUI tool. I am trying NTLM and even Basic Authentication, however, I did not get success. It shows me '403 Forbidden' issue. enter image description here I even tried with or without domain also tried with NTLM, Basic and other methods.

Can someone tell me how to Authenticate right way?

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