I am trying to call a Dynamics CRM Online web service from a SharePoint 2013 workflow in SharePoint online with a HttpSend activity. I am unable to get the call to authorize. The workflow does not automatically send any token for authorization. I've tried getting a token and setting the authorization header manually, but the authorization header seems to be stripped off the request if the header value contains "Bearer", verified by capturing the Http traffic with Fiddler. Both SharePoint and CRM in this case are apart of the same O365 setup and are secured by the same Azure AD directory. I'm hoping someone can validate if this is possible, and if so, point me in the right direction to get it set up.

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It is quite common problem with HttpSend. In the internet people talks about the solution to pass empty Authorization header value (you can read more about it). But in my experience it did not work, when calling my own WCF service.

Maybe you will get some ideas in this post: https://social.msdn.microsoft.com/Forums/azure/en-US/d3b8dd8f-a1ab-4a52-be58-dfb3e1f2b2eb/httpsend-to-call-custom-wcf-service

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