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How to authenticate SharePoint online List service using web services. I have tried many solutions nothing was working.

https://www.c-sharpcorner.com/UploadFile/40e97e/sharepoint-2010-web-services/

closed as unclear what you're asking by Asad Refai, Gaurravs, MHeld, Waqas Sarwar MVP Nov 28 '18 at 14:51

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • what have you tried so far? which kind of solution your are trying to connect via? Provide in detail information to understand the root cause – Gaurravs Nov 28 '18 at 9:53